Bookmaker and pari-mutuel betting: Is a (reverse) favourite-longshot bias built-in?
A widely documented empirical regularity in gambling markets is that bets on high probability events (a race won by a ``favourite'') have higer expected returns than bets on low probability events (a ``longshot'' win). Such favourite-longshot (FL) biases however appear to be more severe and persistent in bookmaker markets than in pari-mutuel markets; the latter sometims exhibit no bias or a revers FL bias. Our results help understand these differences: the odds grid in bookmaker markets leads to a built-in FL bias, wheras that used in pari-mutuel betting pushes these markets toward a reverse FL bias.
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