Among the biggest problems are the existence of momentum and the relatively poor performance of small growth stocks—as well as any security with a lotterylike (or jackpot) distribution. These anomalies continue to occur even after they become known through the publication of academic research. The question is, Why, then, do such anomalies continue to persist?

One explanation offered by researchers attempting to answer this question is that there are limits to arbitrage, which prevents rational investors from exploiting the anomaly. For example:

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