Abstract
In sports betting markets, bookmakers may take speculative exposures to the game outcomes when they can assess the probabilities better than others. We propose a simple model of fixed-odds betting markets in which bookmakers tilt their odds to maximize their own speculative profits. They do so by accommodating bettors’ irrationality, thereby reinforcing systematic biases in betting markets. In European football betting markets, the Favorite-Longshot Bias and the Hot-Hand Bias persist despite the increased competition. This is difficult to explain only by bettors’ irrationality but consistent with the predicted odds-setting behavior of bookmakers. We discuss the implications for financial market anomalies.
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