Time series momentum trading in green stocks

Gagari Chakrabarti · Chitrakalpa Sen

18 citations0/0 files storedStudies in Economics and Finance

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Financial Markets and Investment Strategies Stock Market Forecasting Methods Sustainable Finance and Green Bonds

Abstract

Purpose The purpose of this study is to explore the inherent instability, if any, in the context of investment in stocks of environment friendly companies (or the “green” stocks) across the globe using the time series momentum (TSM) trading strategies. Design/methodology/approach Using the monthly data for the Green Indexes from the USA, the Europe and the Asia-Pacific region over 2003-2019, the authors construct TSM trading strategies to examine the efficacy of regional Green Indexes as well as two diversified global green portfolios to offer abnormal return to attract investors, particularly speculators. The authors’ explore further whether such strategies could operate as hedging instrument. A comparison of results across different regions helps the authors establish a universal nature, if any, of investment in green stocks. Findings The study finds that regional Green Indexes are unable to outperform the market. The global green portfolios perform significantly better. The inefficacy of the relevant time series momentum trading strategies rules out the possibility of speculations. However, the number of profitable momentum strategies is significantly higher for the diversified portfolios in longer run. The portfolios perform significantly better in outperforming the buy-only strategies as well. The stable market, escalated demand and the resulting increment in valuation of green stocks make adoption of greener technologies a choice rather than a forced obligation. This offers a solution to the problem of Tragedy of Common. Originality/value Sustained increase in investment in green stocks is crucial from an environment perspective, as better valuation of their stocks would indubitably convince firms to reduce their carbon footprints. A continued enthusiasm however would require investors’ faith in it. Presence of momentum profit would invite speculators leading to irrational exuberance, dwindling confidence and consequent fragility. Literature on green investment is relatively sparse with the threat of its vulnerability issues left largely unnoticed. The authors’ study fills these gaps.

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References

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