Decomposing Wage Inequality Change Using General Equilibrium Models

Lisandro Abrego and John Whalley
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Lisandro Abrego: International Monetary Fund

No 20022, University of Western Ontario, Economic Policy Research Institute Working Papers from University of Western Ontario, Economic Policy Research Institute

Abstract: This paper presents ex post decomposition analysis of wage inequality change using multi-sector general equilibrium models. The analytical structure used is a specific-factors model of trade, which we calibrate to UK data for two years, 1979 and 1995. We first calibrate our general equilibrium trade model to observations on wage inequality, trade, production and consumption spanning these years, capturing the separate influences of trade, technology and demographics on inequality. Between these years wage inequality changed, but multiple changes in exogenous variables occurred (world prices, technology, endowments). We use calibration techniques to determine parameter values consistent with both the equilibria and the changes in exogenous variables contributing to the wage inequality change being decomposed. We then compute counterfactual equilibria in which only some of the changes in exogenous variables are present to allow us to assess what portion of the observed change is attributable to the various contributing factors. Our findings are that the role factor-biased technological change is larger than in earlier literature. We also find changes in factor endowments to offset increased inequality generated by trade and skilled-biased technological changes, a feature that seems to have gone relatively unnoticed in earlier literature.

Date: 2002
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