Abstract
The authors suggest a way to teach Keynes's principle of effective demand using a standard aggregate labor market diagram that should be familiar to students taking an advanced undergraduate course in macroeconomics. The analysis incorporates Kalecki's version of the effective demand model to show Keynesian unemployment as a point on the aggregate labor demand curve inside the aggregate labor supply curve. The well-known Keynesian policy conclusions apply. In particular, workers and firms are unable to restore full employment by reducing real wages, underlining how important is the macroeconomic duty of the monetary and fiscal authorities to manage aggregate demand growth.
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