Firms are under increasing pressure to justify their marketing expenditures. This evolution toward greater accountability is reinforced in harsh economic times when marketing budgets are among the first to be reconsidered. To make such decisions, managers must know whether, and to what extent, marketing's effectiveness varies with the economic tide; however, surprisingly little research addresses this issue. Therefore, the authors conduct a systematic investigation of the business cycle's impact on the effectiveness of two important marketing instruments: price and advertising. To do so, they estimate time-varying short- and long-term advertising and price elasticities for 150 brands across 36 consumer packaged goods categories, using 18 ye...