From 1981 to 1991 the mean earnings of immigrants fell further behind those of natives in Hong Kong, with the earnings gap widening from 11.3% to 25.5%. Earnings divergence of this magnitude is rather unusual among countries that receive many immigrants. We show that earnings divergence in Hong Kong is mainly due to divergence between skill prices for immigrants' education and for natives' education. Intertemporal shift in the demand for skills caused by economic restructuring in Hong Kong has a differential impact not only on prices of different levels of skill, but also on prices of skills from different sources.

A substantial literature has developed to estimate the “true” cyclicality of real wages, that is, composition bias free. Two major issues are addressed in this article: aggregation of heterogeneous workers and potential bias in the measurement of the labor input. A general analysis of the biases is presented, and alternative approaches in the literature are nested in a single framework. Estimates based on an efficiency units concept that avoids the usual aggregation problems are presented. Composition bias underestimates the usual parameters of interest unless both the price and the quantity of the labor input are adjusted appropriately.