The NAIRU, Aggregate Demand and Investment

Abstract

The nature of the non‐accelerating inflation rate of unemployment (NAIRU) is analysed. The focus of our analysis is the role of aggregate demand and capacity in the context of the NAIRU. Two aspects of the relationship between the level of aggregate demand and the NAIRU are of particular significance. First, it is argued that the real wage–employment relationship based on enterprise decisions cannot be fully articulated without reference to the level of aggregate demand. Second, a model which allows for variable returns to labour and the notion of full capacity is used to explore the effects of shifts in the capital stock on the real wage–employment relationship. The model is specifically used to explore whether a sufficiently expansionary environment can generate sufficient investment to shift that relationship until the NAIRU is compatible with full employment. A number of limitations on the conclusions reached are considered, and the policy implications are briefly considered.

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