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Asset Pricing and Sports Betting

date Date: July 1, 2016
date Author(s): Tobias J. Moskowitz
date Affiliation: University of Chicago

I use sports betting markets as a laboratory to test behavioral theories of cross-sectional asset pricing anomalies.Two unique features of these markets provide a distinguishing test of behavioral theories: 1) the bets are completely idiosyncratic and therefore not confounded by rational theories; 2) the contracts have a known and short termination date where uncertainty is resolved that allows any mispricing to be detected. Analyzing more than a hundred thousand contracts spanning two decades across four major professional sports (NBA,NFL, MLB, and NHL), I find momentum and value effects that move betting prices from the open to the close of betting, that are then completely reversed by the game outcome. These findings are consistent withdelayed overreaction theories of asset pricing. In addition, a novel implication of overreaction uncovered insports betting markets is shown to also predict momentum and value returns in financial markets. Finally,momentum and value effects in betting markets appear smaller than in financial markets and are not large enough to overcome trading costs, limiting the ability to arbitrage them away.

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