The Portuguese economy has been characterised by modernisation since the post-war period. Lisbon and the Tagus Valley is a centre of this process. Hence, this region faces a high demand for highly skilled labour. This paper analyses rates of return on human capital in the region of Lisbon and in the rest of the country in the period 1982- 1992. An assignment model of heterogeneous workers to heterogeneous jobs is discussed. We also develop a cook-book recipe for its estimation. The main implication, a high return being associated with similar workers being assigned to more complex jobs, is born out by the data. Apparently new technology in Lisbon triggers the demand for human capital, not the other way around. The estimation procedure allows us to obtain a simple, free dimension, parameter that measures the heterogeneity in jobs and therefore the ease of substitution between worker types. This is called the complexity dispersion parameter. Calculations suggest that paying half the optimal wage level is about to double the cost per efficiency unit of labour.
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