The “Perpetually†Efficient Stock Market Nonsense: The Gaslighting Effects

Michele Anelli and Michele Patanè

Journal of Finance and Investment Analysis, 2023, vol. 12, issue 2, 1

Abstract: One of the conventional and commonly accepted assumption in the financial world is the Efficient Market Hypothesis (Fama, 1970). However, the intellectual dominance of the efficient-market revolution has more been challenged by economists who stress psychological and behavioral elements of stock-price determination and by econometricians who argue that stock returns are, to a considerable extent, predictable (Malkiel, 2003). “Boom-bust†patterns are the empirical evidence of the efficient market nonsense. We suggest a theoretical linkage between the EMH and the Reflexivity Theory focusing mainly on the psychological profile. We suppose that, during stages of market exuberance/panic, the market pricing produces “gaslighting effects†and that mean-reverting behavior (i.e., contrarianism) is the result of participants’ awareness of psychological deviation from reality. We suspect that investors “benchmarking†plays a primary role on this latter aspect. Outside bubbles episodes, the market pricing is generally efficient and reflects the fundamental value evolution, without producing gaslighting effects.  JEL classification numbers: G10, G11, G14.

Keywords: Efficient Market Hypothesis (EMH); Reflexivity Theory; Gaslighting Effects. (search for similar items in EconPapers)
Date: 2023
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