Equilibrium Unemployment in Australia: Concepts and Measurement *

This paper reviews some concepts of equilibrium unemployment and outlines the fundamental difficulties facing any attempt to produce estimates of the equilibrium rate of unemployment. It develops simple quasi‐reduced form models of aggregate unemployment based on rival non market‐clearing and market‐clearing theories. These equations form the basis of an empirical model of aggregate unemployment in Australia since 1969. The empirical evidence suggests that most of the observed increase in unemployment can be attributed to cyclical rather than structural‐frictional factors. However, stylized explanations of cyclical unemployment exclusively along the lines of Keynesian, Classical or equilibrium search theory are found inadequate.