SOME EVIDENCE ON LUMP SUM VERSUS CONVEX COSTS OF CHANGING PRICES

Two models in which price stickiness results from price adjustment costs are tested. One, an (s,S) pricing model, assumes lump‐sum adjustment costs and predicts firms will make relatively large, infrequent price changes. The other assumes convex adjustment costs and predicts frequent, partial price adjustments. Survey data of firms' price behavior reveal patterns consistent with the (s,S) model. However, many of the patterns are also consistent with partial‐adjustment rules, although the high percentage of firms which fix prices for a quarter or more casts doubt on the plausibility of the partial‐adjustment hypothesis.