A contaminant trypsin-like activity from the timothy grass pollen is responsible for the conflicting enzymatic behavior of the major allergen Phl p 1

► We model two hospitals which have regulated prices and compete on quality. ► We examine changes in the level of information about hospital quality. ► Increasing information will increase quality if hospital costs are similar. ► Increasing information will decrease quality if hospital costs are very different. ► Welfare effects depend on ex-ante or ex-post assumptions about quality information.