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We show that cryptocurrency markets are plagued by pump-and-dump manipulation, with at least 355 cases in seven months. Unlike stock market manipulators, cryptocurrency manipulators openly declare their intentions to pump specific coins, rather than trying to deceive investors. Puzzlingly, people join in despite negative expected returns. In a simple framework, we demonstrate how overconfidence and gambling preferences can explain participation in these schemes and find strong empirical support for both mechanisms. Pumps generate extreme price distortions of 65% on average, abnormal trading volumes in the millions of dollars, and large wealth transfers between participants. These manipulation schemes are likely to persist as long as regulators and exchanges turn a blind eye.

A New Wolf in Town? Pump-and-Dump Manipulation in Cryptocurrency Markets