The adaptive markets hypothesis: Insights into small stock market efficiency

Mikael Rönkkö, Joonas Holmi, Mervi Niskanen and Markus Mättö

Applied Economics, 2024, vol. 56, issue 25, 3048-3062

Abstract: In this paper, we explore whether the adaptive markets hypothesis (AMH) describes the efficiency of the Finnish stock market better than the efficient markets hypothesis (EMH) does. Building on this, we also test how small market size and market liberalization impact the efficiency of the Finnish stock market and examine the relationship between market volatility and return in this market. We conduct this study by applying the subsample analysis and the rolling window analysis to the daily returns of the OMXH25 index and by measuring the efficiency through three linear and two nonlinear predictability tests. The results of our study strongly support the AMH. They also suggest that small market size alone does not make a market less efficient; opening a market to foreign investors improves its efficiency after a delay; and the correlation between market volatility and return varies over time in the Finnish stock market, being usually negative. These findings mostly contradict the traditional investment paradigm.

Date: 2024
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DOI: 10.1080/00036846.2024.2326039

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