Syllabus clarification. In Chapter 6 “Nominal Rigidity” in the Fourth Edition of Romer’s book only the first four sections (sections 6.1-6.4, pages 238-267) are on the reading list (see the document labeled “Syllabus”). These sections correspond broadly to Chapter 5 “Traditional Keynesian Models” in the Third Edition, Sections 5.1 and 5.3-5.6. The purpose of this part of the reading list is to make sure that everyone knows central concepts from standard undergraduate macroeconomics like IS-curve, AD-AS-model, Phillips curve etc and to help people compare the real business cycle approach to the Keynesian approach. Details beyond that are not required.