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The effect of police practices on the rate df robbery in 35 large American cities is estimated by a set of simultaneous equations. The measures of police resources (patrol units on the street) and police activity on the street (moving citations issued) are more precise than. anything thus far available in studies of this kind and permit the use l" identification restrictions that allow stronger inferences about the causal effect of arrests on crime rates than has heretofore been possible. Police resources and police activity indeper'tdently affect the robbery rate after controlling for various socioeconomic factors. The political arrangements that lead to the use of aggressive patrol strategies are discussed and their effect estimated. The implications for, and limitations upon, policy are also discussed.

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