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There are two broad classes of sticky-price models that have become popular in recent years. In the first class, prices adjust infrequently by assumption (so-called time-dependent models) and in the second class prices adjust infrequently because there is assumed to be a fixed cost of price adjustment (so-called state-dependent models). In both types of models it is common to assume that there are many goods, each produced with identical technologies. Consumers have a preference for variety, but their preferences treat all goods symmetrically. These assumptions mean that it is efficient for all goods to be produced in the same quantities.
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