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The purpose of this article is to challenge the thesis (very common in textbooks of macroeconomics and the history of economic thought) that Keynesian economic policy is effective only when introduces a rigidity of prices and/or wages in the models of the neoclassical synthesis. We examine the models of the old synthesis and the new synthesis to show that it is rather the asymmetry of the wage relationship that forms the basis of the effectiveness of Keynesian economic policies. We test an alternative model of the new synthesis to show that the assumption of price rigidity is not necessary for obtaining an efficiency result of the stimulus policy.JEL: B00, B22, E12, E60