This article empirically tests the theory that prices are affected by
consumer information. It develops an empirical model (the increasing
monopoly model) based on the notion that an increase in the number of
sellers of a "reputation" good may cause price to increase because such
an increase makes consumer search less efficient. The model is tested
with data on the prices of primary care physicians' services in 92
SMSA's. The increasing monopoly model is found to be superior in
explanatory power to a model based on the modified target income theory
of physician pricing.