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This paper shows how increased goods market competition affects the behavior of inflation in a multisector economy. By raising the price elasticity of demand, increased goods market competition theoretically lowers inflation and makes the aggregate price level less sensitive to aggregate demand shocks. We find that proxies for the aggregate degree of goods market competition are statistically and economically significant in short‐run Phillips curve models of core inflation. Evidence indicates that heightened goods market competition has flattened the slope of the short‐run, expectations‐augmented Phillips curve and slightly lowered the nonaccelerating inflation rate of unemployment (NAIRU).