Publication:
Do Gamblers Correctly Price Momentum in NBA Betting Markets?

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Authors
Arkes, Jeremy
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Date of Issue
2011-07-15
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Abstract
There is little research on whether new information is correctly synthesized in prediction markets. Previous studies have found evidence consistent with, but have not proved, gambler misperceptions on the existence of momentum effects in the NBA. I use novel momentum measures that, unlike prior studies, incorporate the strengths of the opponent and the wins (or losses). With these measures, I test whether gamblers correctly synthesize information on momentum in the NBA. Contrary to previous studies, I find strong evidence for the existence of a momentum effect. Furthermore, gamblers incorporate momentum into their beliefs on the game outcomes. Gamblers, however, significantly overstate the importance of momentum. But, there is little evidence that the extent of this gambler misperception is large enough to generate market inefficiencies, or profit opportunity. Still, the gambler mis-pricing of the information has implications for how well new information is synthesized in other types of prediction markets.
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Graduate School of Business & Public Policy (GSBPP)
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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