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Do select macroeconomic factors drive momentum returns?
Future Business Journal volume 7, Article number: 51 (2021)
Abstract
In this paper, we examine the presence of shortterm and longterm momentum returns in Indian stock market. The study also tries to shed light on the power of asset pricing models and select macroeconomic variables in explaining momentum returns. The results confirm the presence of shortterm and longterm momentum returns in Indian stock market. It is also found that Carhart fourfactor model’s performance is relatively superior to other factor models such as one factor capital asset pricing model and Fama–French threefactor model in terms of capturing momentum returns. Finally, macroeconomic variables which are considered for analysis do not have any power to explain momentum returns.
Introduction
In financial research, it is an established fact that future stock returns can be predicted by stock price information. So that, investors can earn abnormal returns from stock market by using strategies based on prior returns. Globally, two prominent trading strategies based on stocks’ past returns are used by large body of researchers, namely momentum and contrarian strategies. Contrarian strategy talks about price reversal which means past losers are future winners and past winners are future losers (see [8, 9]). That means shorting the past winners and holding past losers generates abnormal returns for investors if they rank and form portfolios of stocks based on their longterm (3–5 years) past returns. On the other hand, momentum strategy is based on the hypothesis of price continuation which means past winners will remain future winners and past losers will continue to lose in future (see [17]. In the case of momentum strategy, investors need to sell past losers and buy past winners to earn abnormal returns. This can be achieved by the investors if they form portfolios based on past returns of stocks over a shorter time period of 3–12 months.
Momentum behaves in a different manner compared to other asset pricing anomalies such as size, value, profitability, asset growth, and human capital in terms of earning returns. The returns from other anomalies fade away when the information related to it becomes public as investors try to maximize their profit by exploiting it. However, it is not same in the case of momentum as the sources of momentum are mysterious facts for the investors pursuing wealth enhancement. Thus, it has drawn significant attention of the researchers and practitioners as it is an economically viable trading strategy giving significant returns on stocks. Further, the strategy is being used by the investors almost in all the equity markets across the world. Jegadeesh and Titman [17] (hereafter JT1993), De Bondt and Thaller [8, 9], Shen et al. [30], Schaller [25], Pirrong [22] document that both the strategies tend to earn abnormal returns in shortterm and longterm time horizon.
Researchers are divided into two groups as to the debate on sources of momentum returns. One group attributes it to the rational sources and finds that underlying momentum returns can be explained by certain common risk factors, whereas others are of the view that irrational/behavioral sources such as investors underreaction (overreaction), and sentiments are the main sources of momentum returns.
Chen et al. [3] find that momentum returns are systematically priced by certain macroeconomic risk factors such as spread between long and shortterm interest rates, expected and unexpected inflation, industrial production, and spread between high and lowgrade bonds. Fama and French [10] reveal that firm characteristics which are otherwise known as anomalies/risk factors like size, P/E, cash flow/price, and booktomarket equity are the sources of momentum returns. Conrad and Kaul [5] and Berk et al. [2] also report that systematic risk factors are responsible for momentum returns. Further, they also find that crosssectional variation in mean return plays an important role in explaining momentum returns in both shorter and longer time horizons. Moskowitz and Grinblatt [20] document a strong momentum effect in industry components of stock returns and confirm that these returns can be explained by momentum anomalies of individual stocks. Jhonson [18] is of the view that momentum returns can be captured by an enhanced model which includes standard asset pricing anomalies along with growth rate shocks as additional risk factor. Sadka [23] demonstrates that market should consider liquidity risk factor in addition to other systematic risk factors to get a better explanation about momentum returns. Sagi and Seasholes [24] find that three new systematic risk factors such as revenue, cost, and growth options that can drive momentum. Finally, they conclude that momentum strategies that consider firms with high revenue growth volatility, low costs, and valuable growth options outperform the traditional momentum strategies by five percent per year.
Contrary to above findings, some researchers contend that irrational sources such as investors’ sentiment, overreaction, or underreaction are the main reasons of momentum returns. Barberies et al. [1] find that irrational sources tend to drive momentum returns. They also corroborate that underreaction or overreaction of the investors to good news or bad news about a specific firm such as earning announcement drives momentum returns. Daniel et al. [7] employ a model based on overreaction to private information and reveal that predictability of returns becomes stronger with greater information asymmetries. Supporting the above facts, Grinblatt and Maskowiz [14] suggest if investors consider additional factors such as seasonal effects and tax environment in their strategies, they can earn greater abnormal returns than others. In addition to the above findings, Chui [4] finds another irrational source of momentum, namely individualism, which is positively related to the momentum returns. Some authors attribute momentum returns to the “Disposition effect.” Increase or decrease in stock prices due to investors’ behavior of buying or selling stocks based on what others do is termed as disposition effect. A bunch of literature (see [11, 13, 15, 29] empirically examines and reports that disposition effect results in momentum returns in stock market.
The macroeconomic variables are known as the economic fundamentals of any country which have direct or indirect impact on the capital market. Evidences for the macroeconomic variables as sources of momentum returns are prevalent across the stock markets around the world. Again, there are differences in the opinion among researchers about this fact. While some of the researchers report macroeconomic variables have positive impact in explaining momentum returns, some find that they don’t have any power to capture the momentum returns.
Griffin et al. [12] examine the power of macroeconomic risk in explaining the momentum returns. The sample includes the stocks of 39 countries across the globe. The study finds that neither an unconditional model of Chen et al. [3] nor a conditional model of lagged instruments provides any proof that macroeconomic risk variables can explain momentum returns. They also find a strong presence of momentum everywhere which is economically large and statistically reliable. Contrary to Griffin et al. [12], Sehgal and Jain [28] exhibit that the unexplained momentum returns in Indian stock market are explained by both rational and irrational sources. They also reveal that lagged macroeconomic variables have the power of explaining the underlying price momentum of Indian stocks.
Hutchinson and O’Brien [16] verify if there is any connection between time series momentum strategies and business cycle. The results show that linear macroeconomic factor model is unable to explain momentum returns. However, these macroeconomic variables become statistically significant once they are included in a model which allows the coefficients to change over the time. Cooper et al. [6] examine the power of global macroeconomic risk in explaining abnormal returns generated from portfolios. By considering different asset classes of different countries (USA, UK, Continental Europe, Japanese, country equity index futures, currencies, government bonds, and commodity futures) and forming a total of 48 portfolios, the study finds that global macroeconomic risk can explain the abnormal returns on various assets from different countries. Liu et al. [19] verify whether macroeconomic factors influence each firm differently by predicting the return from macroeconomic variables. They also examine the power of these variables in capturing momentum payoff. The study follows the CS (2002) methodology and finds that if the returns are predicted by using macroeconomic variables, the past winners produce higher expected returns and past losers generate lower expected returns. It also reports that discount rates of winner go downward, whereas discount rates of losers move upward.
A handful of works which have been carried out by researchers in Indian context to examine the effect of macroeconomic variables in explaining the momentum returns. However, some studies have tested other factors of asset pricing such as size, value, leverage, profitability, and human capital and found positive impact in Indian stock market. Sehgal and Balakrishnan [26] examine the availability of systematic return pattern in stock returns and find a reversal in longterm returns and continuation in shortterm returns. The authors also find that contrarian strategies provide moderate positive returns, whereas the momentum investment strategies provide strong positive returns. Sehgal and Balakrishnan [27] test the power of prominent risk models to get an explanation about the momentum returns. Their results suggest that CAPM is unable to capture the momentum returns, whereas the FF3 factor model gives partial explanation of the momentum returns. Sehgal and Jain [28] verify the presence of both shortterm momentum and longterm contrarian pattern in Indian stock market. They observe a strong shortterm momentum pattern which provides high returns in India. However, they also report a weak reversal pattern in the case of longterm momentum strategies after controlling the shortterm momentum effect. Narayan et al. [21] try to find out sources of returns in Indian stock market. They suggest that returns disappear once they consider some risk factors along with a range of macroeconomic variables.
Despite plenty of debates about the sources of momentum returns, a conclusive result is yet to be arrived at about whether the systematic risk factors/rational sources or irrational sources are the drivers of momentum returns. Further, it is evident that the performance of Indian capital market has been consistently on the rise and resulting in deriving the investors’ reaction/sentiment. Hence there is a researchable question that whether the investors’ sentiment triggers price fluctuations which may cause price momentum. So this study attempts to verify if shortterm and longterm momentum returns continue to exist in Indian stock market. Next, we examine the power of prominent risk models in explain the momentum returns. Further, the study also examines whether select macroeconomic variables can be considered as driving forces of momentum returns.
Data
The study takes monthly adjusted closing share prices^{Footnote 1} data of 482 companies for the period from July 2002 to November 2018. The companies that are taken for this study are part of Bombay Stock Exchange (BSE)500, which is broad based market index in India which is one of the giants of Indian secondary equity markets covering majority of the trading activities. It also accounts for larger market capitalization of Indian listed companies.
For further estimation and analysis, the percentage monthly returns are calculated from monthly share prices. The study also includes the characteristics data of stocks such as market capitalization^{Footnote 2} (MC), pricetobook ratio^{Footnote 3} (P/B). Besides above, macroeconomic variables’ data such as dividend yield of BSE200^{Footnote 4} index, term spread (difference between longterm bond yield and shortterm bond yield), and 91day Tbill^{Footnote 5} yield are used in the study. The data used in the study are collected from BLOOMBERG database.
Methods
We start with formation of singlesorted portfolios of the individual securities on the basis of past excess returns and company characteristics such as size and value being measured by MC and P/B ratio, respectively. Then we form doublesorted portfolios to arrive at the mimicking portfolios such as SMB, LMH, and WML (definitions for these abbreviations are presented in the later section). The next set of double sorting is carried out considering momentum returns and macroeconomic variables to examine the impact of macroeconomic variables on momentum returns.
Singlesorted portfolios
Singlesorted portfolios are constructed using JT1993 methodology. The portfolios are based on j/k months strategy where j months represent portfolio formation period while k months denote portfolio holding period. The stocks are ranked according to their past returns based on respective investment strategies (3–3, 6–6, 12–12, 36–36, and 60–60 months). We start with 3–3 investment strategy. In the month of October 2002, the stocks are ranked on the basis of their past threemonth average excess returns and classified into five portfolios, P_{1} to P_{5} where P_{1} consists of bottom 20 percent of the sample stocks and P_{5} contains of top 20 percent of the stocks. Then equally weighted excess returns are estimated for next three months for respective portfolios.This process is replicated for portfolio formation for other time windows as well till November 2018.
Doublesorted portfolios
Size, value, and past excess returns are used to form doublesorted portfolios. MC and P/B ratio are used to form sizevalue portfolios, whereas MC and the cumulative returns (CRs) are used to form sizemomentum portfolios. In the month of June of year t, the sample securities are ranked and sorted into two groups, namely small and big by taking MC. The above size classification of small is symbolized by ‘S’ and big is abbreviated as ‘B’. Then the same sample stocks are again ranked on P/B ratio and made three groups such as low, medium, and high. The value classification of low is symbolized by L, medium is abbreviated as M, and High is shortened to be H. We follow the breakpoint convention of using 50:50 for ranking the stocks on size and 33.33, 33.33, and 33.33 for ranking the securities on PB ratio. We intersect two size groups and three value groups and get six portfolios of S/L, S/M, S/H, B/L, B/M, and B/H where S/L includes small size and low value stocks, whereas B/H carries big size and high value stocks. Next, equally weighted excess returns are calculated on each of the above six portfolios from July 2002 (t) to June 2003 (t + 1). Then, as part of review of portfolios’ performance, portfolios are rebalanced in June 2003. Further, in the process of rebalancing portfolios, stocks may get displaced from their original characteristics such as small and big and so on. The stocks that could be small in terms of size in one year may become big in another year in the process of rebalancing. Then we form sizemomentum portfolios using the same breakpoints as that of sizevalue portfolios. Next, keeping size classification constant, we rank the sample securities on 11month cumulative returns and make three groups, namely loser (symbolized by L), neutral (N), and winner (W). Then by getting size intersected with momentum, six portfolios, namely S/L, S/N, S/W, B/L, B/N, and B/W, are formed. S/L is a combination of portfolio which includes small size and loser stocks, whereas B/W carries a portfolio which contains big size and winner stocks. Next, equally weighted excess returns are calculated on each of the above six portfolios from July 2002 (t) to June 2003 (t + 1). Then we rebalance the portfolios in June 2003, and this rebalancing of portfolios is carried out until the study period gets over. Further, in the process of rebalancing, change of stocks’ characteristics from loser to winner and vice versa is quite possible. Hence in order to have accosted approach as portfolio strategy to make significant returns on portfolios, the portfolios are rebalanced every year. However excess returns on above six portfolios are not reported in the study as the purpose of the estimation of these returns is to form mimicking portfolios such as SMB, LMH, and WML.
Next, we adopt the methodology of Fama–French (1993) and SehgalJain (2014) to form mimicking portfolios such as SMB, LMH, and WML. SMB is an abbreviation of “small minus big” which mimics for the portfolio’s risk in relation to company size. LMH has the expansion of “low minus high” which mimics for the risk involved in portfolio’s return with regard to company value. Finally, WML is the short form for “winner minus loser” which mimics the risk involved in stocks’ prior returns (Momentum factor) during different time horizon. The formulas for the above mimicking portfolios are as follows.
SMB (small minus big)
LMH (low minus high)
WML (winner minus loser)
Sorting of forecasted portfolios on the basis of macroeconomic variables
The study uses three important macroeconomic variables related to stock market to predict the return and then examines the importance of these predicted returns in explaining momentum returns as done in the previous studies by forming portfolios based on these returns. The variables are dividend yield, term spread, and 91day Tbill yield. The empirical underpinning behind using these variables is as follows.
In this study, dividend yield refers to the dividend yields of BSE200 index over past 12 months. Previous studies have shown that this factor is related to slow mean reversion as it has a direct impact on the stock prices. Stock prices tend to change to the dividend payments. Stock prices are less when the discount rate and expected returns are high and vice versa. Hence this factor is used as proxy for time variation in the unobservable risk premiums. The term spread is the difference between month yield on 10year longterm bond and 91day Tbill. This variable is included in the study because it is closely related to shortterm business cycle. Yield on 91day Tbill is negatively related to future market returns because current yield on Tbill contains the future expected yield. Hence, increase or decrease in interest rate has a definite impact on stock returns. Thus, this variable is expected to proxy for future economic activity.
Next, to test the above, we regress the returns on each stock for last 60 months for three macroeconomic variables using the following regression equation:
where R_{it}, α_{it}, β_{i1}, β_{i2}, and β_{i3} denote the returns of stock, intercept, and the sensitivity coefficient of stock i in month t, respectively, whereas DIV_{t}, TERM_{t}, YLD_{t} are termed as dividend yield of the BSE200 index, term spread (difference between yield of longterm bond and 91day Treasury bill), and 91day Tbill yield.
The value of the factor loadings (intercept and the sensitivity coefficients) is obtained from the above regression to predict future returns based on macroeconomic variables. The returns are predicted for next six months using above factor loadings, and then equally weighted portfolios are formed based on these forecasted returns. After that, the initial six months are excluded from 60 months and the six months for which returns are already predicted are added to the data to predict the return for the next six months and the process is repeated till the end of the time period considered for the study.
Twentyfive portfolios (5*5) are formed by using predicted returns derived from factor loadings of macroeconomic variables and actual average returns of the stocks. To form those 25 portfolios, the stocks are divided into quintile (FP_{1} to FP_{5}) based on predicted returns and then within each quintile the stocks are again ranked into quintiles (FP_{1} to FP_{5}) by using their actual average returns. If any of the portfolios formed on average returns and conditioned on predicted return generate positive returns, then it can be concluded that the model based on macroeconomic variables is unable to explain the available momentum returns in Indian stock market.
Results and discussion
Evidence of momentum returns on portfolios
Table 1 shows the average return, standard deviation, and tvalue of portfolios sorted on returns of sample stocks. After forming portfolios for different trading strategies that are explained above, first we calculate mean excess return on each portfolio to check the availability of momentum returns in Indian stock market. Next, standard deviation is calculated to measure the monthly variances of the returns on sample stocks. Then tstatistics for different portfolios are computed to verify whether returns generated by portfolios are statistically significant. If the mean returns on portfolios of any trading strategies are positive, then it shows the availability of positive momentum returns in Indian stock market.
Table 1 shows availability of strong momentum returns in Indian stock market as almost all the portfolios based on past returns of the trading strategies generate positive average returns. Specifically, the portfolios which contain the top twenty percent stocks provide highest returns which are 0.022, 0.026, 0.024, 0.022, and 0.314 in the case 3–3, 6–6, 12–12, 36–36, 60–60 strategies, respectively. The tstatistics of all the above portfolios are statistically significant at 5% level (two tail). Further, it is clearly observed that the portfolios’ average returns exhibit a pattern of being lower to higher average returns on loser portfolio to winner portfolio. This average return pattern exactly meets the core premise of the momentum strategy.
Momentum returns and risk models
It is a welldocumented fact that strong momentum returns are available in Indian stock market. As discussed above, debate over the sources of momentum returns is also evident as lot of studies has been carried out across the world to find an appropriate answer to it. Despite a plethora of work on this debate, there is no conclusive evidence about the sources of momentum returns. Of late, some researchers suggested some risk models that consist of risk factors related to stocks can explain the momentum returns. Risk models such as CAPM, FF3 factor model, and Carhart fourfactor model gain importance over the time as these models are tested widely by researchers across the globe and found to be explaining the momentum returns up to certain extent. In the case of Indian stock market, it is not different as well. Some studies test these models and find that they can partially explain the underlying momentum returns. This study revisits the above fact and tests the power of these prominent risk models in explaining the momentum returns with an updated dataset in terms of time period and the sample used for the study which is shown in this section.
Capital asset pricing model (CAPM)
Capital asset pricing model (CAPM) of Sharpe (1964), Linter (1965), and Black (1965) solves the quest of risk and expected return relationship over a long period of time for academicians, researchers, and empiricists. Hence, in this study, we employ CAPM to check whether the risk factor is accounted for above unexplained returns. For that, we regress the excess return on each portfolio for the excess return on market. An excess return version of market model is used to run CAPM which is stated below.
where R_{pt} − R_{ft} refers to the excess return of portfolio over the riskfree rate. The α denotes the abnormal return on portfolio which is otherwise called as intercept term. β is called the sensitivity coefficient of excess market return, and R_{mt} − R_{ft} is the excess market return over the riskfree rate. Finally, e_{t} is the disturbance term which includes the factors that are not considered in the model.
Table 2 shows the results of CAPM for both the shortterm and longterm periods starting from 3–3month strategy to 60–60month strategy. The failure of CAPM to capture the momentum returns is clearly indicative as the resulting alphas are positive and nonzeros. The alphas of both loser and winner portfolio are 0.015, 0.025, 0.013, 0.029, 0.014, 0.028, 0.003, 0.023, 0.010, 0.029 in the case of 3–3, 6–6, 12–12, 36–36, 60–60 investment strategies, respectively. Almost all the t (α) values of the portfolios are significant at 5% level of significance. The R^{2} values of all the portfolios are around 70% (goodness of fit) across the time periods which is the explanatory powers of the variables used in the model about the extranormal returns in the portfolios. To sum up from the above interpretation, CAPM is unable to explain the abnormal returns of portfolios in Indian stock market.
Fama–French (FF) threefactor model
The inability of CAPM to explain the excess reruns paves way for the genesis of a new dynamic model, namely threefactor model, which is originally developed by Fama–French (1993) which takes into consideration of firm size and value factors along with market factor documented by CAPM. As is the case, we also go on to test FF threefactor model due to the failure of CAPM and to solve the quest of whether this model can explain the momentum returns in Indian stock market. The model specification of FF threefactor model is: 
where SMB is the mimicking portfolio for size factor and LMH is the mimicking portfolio for value factor; s and l are the sensitivity coefficients.
The following tables show the results of FF threefactor model of both shortterm (3–3, 6–6, 12–12) and longterm (36–36, 60–60) investment strategies. According to pricing theory, the intercept value of the time series regression shall be equal to zero so as to ensure that the model is efficient to explain momentum returns. If we look at the alphas, the alphas of the winner portfolios of 3–3, 6–6, 12–12, 36–36, and 60–60 strategies are attenuated and the alphas are in the ranges of 0.16, 0.018, 0.018, 0.008, and 0.008, respectively. In the case of loser portfolios, the alphas are close to zero but still significant. The t(α) of almost all portfolios across the time periods is significant at 5% level. Though R^{2} values improve compared to the CAPM, still it is inconclusive to draw a clear verdict on the fact that FF3 factor model has the power to explain the abnormal returns of portfolios sorted on momentum returns (Table 3).
Carhart fourfactor model (CFF)
The failure of FF threefactor model motivates us to test the CFF model which adds momentum as an additional factor along with other factors in the FF threefactor model. The objective remains same that is whether this fourfactor model can explain momentum returns better than FF threefactor model. The CFF model’s model specification is: 
where WML is a mimicking portfolio which reflects the firms’ risk involved in momentum return and it is calculated by subtracting returns on loser portfolio from returns on winner portfolio. w is the sensitivity coefficient of momentum factor.
Table 4 presents the regression results of CFF model by using the portfolios return and the underlying risk factors such as market risk, size, value, and momentum for both the shortterm and longterm time periods. If we look in details, in the case of longterm investment strategies, the alphas of loser and winner portfolios are close to zero which are 0.005, 0.005, and 0.002, 0.006 for 36–36 and 60–60 investment strategies, respectively, whereas the results show a contradictory result in the case of shortterm momentum strategies as the resulting alphas of both the loser and winner portfolios are positive and nonzeros such as 0.010, 0.011, 0.010, 0.013, and 0.013, 0.014 for 3–3, 6–6, 12–12 investment strategies, respectively. In this case, also the t(α) values are significant at 5% level for almost all the portfolios across the time periods. The results also show the improved R^{2} value compared to previous two models in all the cases which also indicate that the model has better explanatory power. Though it gives better results visàvis other models, still we find positive intercept in the case of certain portfolios for some of the investment strategies. Hence, one can conclude that the model partially explains momentum returns which is in line with previous notable studies.
Macroeconomic variables
As discussed above, researchers have found some empirical evidences about the importance of macroeconomic variables in explaining the abnormal returns on portfolios consisting of various diversified assets in it. Predominantly in developed stock markets, it is found that momentum returns disappear once crosssectional differences in predicted returns are controlled by using lagged macroeconomic variables. This study attempts to test the same by considering momentum in Indian stock market which is one of the fastest growing stock markets across the world and attracted very a smaller number of studies those have considered this gap.
We see in the previous section that wellestablished risk models fail to explain momentum returns. As a result, in this section we try to examine the role of macroeconomic variables in explaining momentum returns which are important measures of market conditions. To study the macroeconomic effect, we first forecast the return based on three important macroeconomic variables (dividend yield, term spread, and 91day Treasury bill yield). Then portfolios are sorted considering this forecasted return and the normal return of sample stocks as well. Then the average returns are obtained from portfolio formed by intersecting both forecasted return and normal return. If any of the portfolios formed based on momentum return and conditioned by forecasted return using macroeconomic variables found to be profitable, that gives us the conclusion that macroeconomic has no power to explain the abnormal returns of portfolios and vice versa.
Table 5 reports the average returns that are obtained by intersecting the forecasted return based on macroeconomic variables and momentum returns of various investment strategies over different time horizon along with their tstatistics in square brackets. The furnished results in the table below are hallucinatory in nature as one might think macroeconomic variables explain the momentum returns. If we look at the results in detail, almost all the portfolios across time the periods generate significant positive returns which entail us to conclude that macroeconomic variables have no power to explain the underlying momentum returns in Indian stock market.
Specifically, the returns of winner portfolios are higher among all other portfolios. The average of all higher predicted quintile and lower predicted quintile portfolios is 1.30, 2.18, 1.64, 2.44, 1.20, 1.78, 1.34, 1.72, and 2.38, 2.64 percent for 3–3, 6–6, 12–12, 36–36, and 60–60 investment strategies, respectively. The t statistics of all the portfolios are also significant at 5 percent level of significance. Furthermore, the difference in mean returns between higher return portfolios and lower return portfolios (P_{5}−P_{1}) is also significant in all portfolios with significant t statistics across the time periods. Hence, these results lend strong support to the fact that macroeconomic variables are unable to explain the momentum return of various trading strategies in Indian stock market.
Practical implications of the study

The results of the study reveal that momentum pattern in Indian stock market persists. The study experiments the presence of momentum in different strategies covering different time horizon. However, strong momentum pattern is observed in 6–6 trading strategy as it fetches the highest returns. Hence, the investors of different classes may consider 6–6 momentumbased trading strategy to earn higher rate of returns on their equity investment. However, investment horizon 60 × 60 could be the best strategy for the investors who are inclined to stay in the market for longer time.

Contemporaneous evidences in financial literature show that a greater role being played by macroeconomic variables in different spheres of financial research being carried out in different financial markets. However, a set of macroeconomic variables are considered in this study to verify whether any role is played by them in momentum returns. The results are counterintuitive. Hence, fund managers, portfolio analysts, market practitioners, investors, and other key stake holders of the market may not consider macroeconomic variables as they do not impact the stock returns from momentum strategy perspective.

Globally eminent academic researchers have evolved several asset pricing models which are capable of explaining excess returns on portfolios based on different strategies. The above models are widely and extensively tested and proved their efficacy in financial markets universally. However, CFF model plays a greater role in capturing average returns on portfolios based on momentum strategy visàvis other factor models. Hence, portfolio managers, market analysts, and other investors can consider CFF model as part of momentum strategy owing to the fact that fourfactor model is able to capture momentum returns partially. The CFF model could enable the above market participants to estimate riskadjusted returns on momentum portfolios.
Conclusions
The longstanding quest to find the proper reason behind the availability of abnormal return on portfolios formed by using past average returns on stocks is still unclear. A numerous number of studies are being carried out by researchers in different stock markets of various geographical locations to check the availability of abnormal momentum returns on portfolios consisting of various stocks and find the proper sources that drive momentum returns. The empirical findings of these studies suggest significant availability of extranormal returns. But the findings regarding the source of these returns are still unclear as no study has given concrete evidence about the fact. Indian stock market is not exceptional to that as it also has strong abnormal momentum returns on the portfolios that include stocks which are traded in this market. A handful of studies have tried to find the sources behind these returns but conclusive evidences are yet to be found in Indian stock market.
So, the foremost objective of the study is to find the sources of abnormal returns on momentumbased portfolios. For this, the study first revisits to verify the availability of momentum returns in Indian stock market which are already found by some previous studies. The next objective of the study is to examine the role played by illustrious risk models such as CAPM, FF threefactor model, and CFF model in explaining such returns. Then the study tries to evince the power of select macroeconomic variables, e.g., dividend yield, term spread, and 91day Tbill yield in subsuming the abnormal returns in portfolios. The monthly share prices of 478 companies over a time period from 2002 to 2018 are used for analysis purpose. The study uses the widely accepted ordinary least square (OLS) method as is the standard benchmark method in asset pricing domain and dynamic forecasting method as is the principal methodology to arrive at the desired results.
The empirical findings of the study show that strong abnormal momentum returns are available in Indian stock market which is in line with the previous findings. The study also reports that the eminent risk models such as CAPM and FF 3 models fail to capture the abnormal portfolios’ return, whereas CFF model gives partial explanation to these returns. Still the study finds significant unexplained returns in some winner portfolios paves way for further examination.
Next, the study also demonstrates and finds that macroeconomic variables have no power in explaining momentum returns as the portfolio formed by using the predicted return provide significant positive returns.The results of the study can be attributable to the theories such as Markowitz portfolio theory 1952), Shape’s capital market theory (1964), and the arbitrage pricing theory which is developed by Stephen Ross in the year 1976. However, the study addresses key issue of relation between momentum returns and macroeconomic factors, and it is constrained by not including several other macroeconomic factors such as inflation, index of industrial production (IIP), and GDP. Perhaps inclusion of above other variables may report a different dynamism in the findings. Further this study is experimented on Indian environment and due to its peculiar characteristics; the findings may not be extrapolated to other markets.
Availability of data and materials
The data which are used in this study for analysis are available in the BLOOMBERG database.
Notes
The original source of database (BLOOMBERG) provides monthly closing price and adjusted closing price. Generally, the companies may go for periodical capital changes such as stocks split, right issues, and stock dividend. However, general closing price of the stocks does not adjust for these capital changes. While adjusted closing prices of the sample stocks do adjust for the capital changes if they occur. Hence, stock returns calculated from adjusted closing prices will reflect the true performance of the stocks. Further, the returns calculated from the adjusted share prices will produce unbiased results.
The study takes MC as a measure of firm size by following the global convention. Further, the study does not use MC as the original form of dataset rather the natural logarithmic value of MC for sample stocks is used. Moreover, MC is taken for the month of June every year with the assumption that the information of MC will reach the investors after three months from closing month (March) of the accounting year.
Following the practice of research in asset pricing in India, the study employs P/B ratio as a measure of firm value. This is the subjectivity of the researchers to use either P/B ratio or book equitytomarket equity (BE/ME) ratio as the measure of firm value. As BE/ME is not directly available in the original data source, the study uses P/B ratio which is inverse to BE/ME. FF (1993) uses BE/ME as a measure of firm value and the same as used to form mimicking portfolio of HML. Hence, our interpretation on P/B is opposite to that of FF (1993).
The study uses BSE200 monthly return being calculated from monthly adjusted closing prices of the index. Further above return is adjusted for risk free return to obtain excess market return which is the proxy for market portfolio. This entails as market return which is one of the independent variables to run the OLS.
There are different government securities available in Indian government securities market from which riskfree rate of interest could be calculated. However, by convention, the study uses returns on 91day Tbill which is one of the riskfree shortterm financial assets in Indian money market.
Abbreviations
 CFF:

Carhart fourfactor
 CAPM:

Capital asset pricing model
 FF3:

Fama–French threefactor
 BSE:

Bombay stock exchange
 MC:

Market capitalization
 P/B:

Price/book ratio
 SMB:

Small minus big
 LMH:

Low minus high
 WML:

Winners minus losers
 CR:

Cumulative returns
 FP:

Forecasted portfolio
 OLS:

Ordinary least square
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This study is completed by the joint effort of the both authors. AB shaped the paper by providing the concept and developing the methods. NB analyzed and interpreted the results of the study. Both the authors have read and approved the manuscript.
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A. Balakrishnan an Associate Professor of finance in the Department of Banking Technology, School of Management, Pondicherry University. He is actively researching in the area of finance and he has published several research papers in leading national and international journal.
Nirakar Barik an Assistant Professor of finance in the Department of Commerce, School of Social Science and Languages, Vellore Institute of Technology, VIT University. His area of research is finance and many of his papers are in the process of publication in reputed journals. This work is a part of his doctoral dissertation which is carried out at Pondicherry university.
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Balakrishnan, A., Barik, N. Do select macroeconomic factors drive momentum returns?. Futur Bus J 7, 51 (2021). https://doi.org/10.1186/s43093021000972
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DOI: https://doi.org/10.1186/s43093021000972