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This paper provides a utility-based definition of binge drinking and examines the compatibility of this phenomenon with rational decision making. Prohibition of young people’s consumption of alcohol is frequently violated with binge-drinking in groups. The analysis considers the roles of peer-pressure, full price of alcohol and crowding in underage group-drinking sessions and identifies the conditions for binge-drinking by expected utility maximizing members. Rational binge-drinking occurs when the impact of the peer-pressure on the individual member’s utility exceeds the loss of utility from the forgone spending on all other goods associated with the expected full marginal cost of consuming alcohol.