Beating the Spread: Testing the Efficiency of the Gambling Market for National Football League Games

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Abstract
In this paper we test the efficiency of the gambling market for Na- tional Football League games. Two efficiency tests are conducted. The first test is derived from the finance literature on market efficiency, while the second test is based on a market's being efficient when the rate of return on any gambling strategy based on publicly available information approximates the bookmaker's commission. While the first test is found to be too weak to establish conclusions about the efficiency of the NFL gambling market, the second test results, showing the existence of profitable betting opportunities, indicate that speculative inefficiencies exist in this market.

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