The aggregate average wage is often used as an indicator of economic performance and welfare, and as such often serves as a benchmark for changes in the generosity of public transfers and for wage negotiations. Yet if economies experience a high degree of (non-random) fluctuation in employment, the composition of the employed population will have a considerable effect on the computed average. In this paper we demonstrate the extent of this problem using data for Poland for the period 1996-2003. During these years the employment rate in Poland fell from 51.2 percent to 44.2 percent and most of this fall occurred between the end of 1998 and the end of 2002. We show that about a quarter of the growth in the average wage during this period could be attributed purely to changes in employment. Copyright (c) 2007 The Authors Journal compilation (c) 2007 The European Bank for Reconstruction and Development .
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