ABSTRACT Operating performance is an important and widely used measure for evaluating firms. This paper documents that, contrary to the common belief, firms experiencing sales declines during economic slowdowns exhibit higher operating margins than firms experiencing sales declines during normal periods. This anomalous behavior results from (1) a decrease in costs of goods sold overall during economic slowdowns and (2) an additional reduction in SG&A costs other than expenditures that could affect the competitiveness (i.e., R&D and advertising) of sales-down firms. The relatively higher operating performance reported by sales-down firms during economic slowdowns is associated with improvements in operational efficiency and cannot be explained as earnings management or simply as a response to financial distress or a large sales decline. Our findings provide important insights into how macroeconomic conditions affect firms' operating performance in a predictable way.