If an asset can achieve excess returns that are not explained by the pricing model, then this phenomenon can be called an anomaly. However, since the knowledge of the genuine pric- ing model is limited, there are always many indicators, that can be derived from financial or quantitative information provided by companies, and the portfolios constructed with them as variables meet the definition of anomaly. Risk compensation, mispricing, and data mining are the three most popular reasons behind anomalies. Risk compensation means that investors receive returns at the expense of taking risks. Mispricing, on the other hand, implies that investors can earn risk-free excess returns through a prudent investment strategy. For spurious anomalies obtained from data mining, effective identi- fication can help avoid overfitting problems. Using the vine copula approach, this master thesis examines the main drivers behind 20 market anomalies under different anomaly return scenarios. According to our research, market anomalies are primarily caused by mispricing, rather than by risk compensation. However, they are most likely the result of data mining when the anomaly returns are low. The findings are robust in different multi-factor models and changes in stock classification criteria to a certain degree. This also represents a refutation of the market efficiency hypothesis, which posits that financial markets are efficient and that prices reflect all available information, to some extent.
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If an asset can achieve excess returns that are not explained by the pricing model, then this phenomenon can be called an anomaly. However, since the knowledge of the genuine pric- ing model is limited, there are always many indicators, that can be derived from financial or quantitative information provided by companies, and the portfolios constructed with them as variables meet the definition of anomaly. Risk compensation, mispricing, and data mining are the three most popular reasons behind an...
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