The topics I study in New Keynesian macroeconomics include price rigidity and flexibility, heterogeneity in price rigidity, price adjustment at multiproduct retailers, asymmetric price adjustment, costs of price adjustment, menu costs, managerial and customer costs of price adjustment, holiday period price rigidity, psychological prices and other behavioral aspects of pricing, price points (with a focus on 9-ending and 0-ending prices), implicit contracts, consumer attention/inattention to prices and price recall, and non-price adjustment mechanisms.