The Existence of an Anomaly in the City Indices in Borsa Istanbul

The aim of the study is to reveal the existence of an abnormal return in the city indices in Borsa Istanbul. Three important calculations were made for the detection of an abnormal return. The first was the calculation of adjusted returns. The second was the calculation of beta coefficients for city indices. The third was the determination of the relationship of each city index to the market. According to the findings obtained, there was an abnormal return in the city indices. In other words, each of the city indices made a profit on market returns. However, these returns were almost equal to market returns. When the beta coefficients were analyzed, it was seen that the coefficients were equal to the theoretically-expressed average market beta coefficient. Thus, the city indices and the market are moving in the same direction, and the results are statistically significant.