Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Macroeconomic models often generate nominal price rigidity via menu costs. In scanner databases, (1) price points, embodied in nine-ending prices, account for two-thirds of prices; (2) at the conclusion of sales, post-sale prices return to their pre-sale levels more than three-fourths of the time; and (3) such memory around sales is stronger if the pre-sale price was a price point. Extending a canonical menu cost model to allow for price points, I estimate an incentive to set nine-ending prices two orders of magnitude larger than the menu costs. The choice of a mechanism for price rigidity matters for aggregate dynamics.