Analisi della forma debole dell'ipotesi di mercato efficiente: un caso di studio di GameStop durante lo short squeeze 2021.

This study aims to analyze the weak form of the Efficient Market Hypothesis (EMH) through a case study on the return of GameStop (GME) price during the 2021 short squeeze. The EMH is a fundamental theory in finance that argues for the efficiency of financial markets in reflecting all available information. However, the GME short squeeze event has raised questions about the applicability of the EMH in situations of extreme volatility and price manipulation. Through a meticulous examination of historical events, this research aims to shed light on the dynamics that contributed to the short squeeze, including the motivations behind participants' actions and how the price of GME reacted during this period. Historical data is used to analyze price returns and evaluate whether these returns align with the principles advocated by the weak form of the EMH. By analyzing the data and discussing the findings, this thesis contributes to a critical understanding of the EMH theory and its application in situations of extreme price volatility. Furthermore, it provides insights for further research on the dynamics of financial markets during exceptional events.