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arXiv · 1112.0829

How Not to Win a Million Dollars: A Counterexample to a Conjecture of L. Breiman

Thomas P. Hayes
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Abstract

Consider a gambling game in which we are allowed to repeatedly bet a portion of our bankroll at favorable odds. We investigate the question of how to minimize the expected number of rounds needed to increase our bankroll to a given target amount. Specifically, we disprove a 50-year old conjecture of L. Breiman, that there exists a threshold strategy that optimizes the expected number of rounds; that is, a strategy that always bets to try to win in one round whenever the bankroll is at least a certain threshold, and that makes Kelly bets (a simple proportional betting scheme) whenever the bankroll is below the threshold.

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Thomas P. Hayes. 2011-12-05. How Not to Win a Million Dollars: A Counterexample to a Conjecture of L. Breiman. https://arxiv.org/abs/1112.0829

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