In this note we study the implications on a bivariate normal Roy model of two sets of monotonicity hypotheses proposed recently by Manski and Pepper (Econometrica, Vol. 64 (2000), pp. 997-1011). In that simple context, we show that these hypotheses imply strong restrictions on the correlations...

We study the effect of the National Minimum Wage (NMW) on the workforce age composition within the low paying sectors of the British economy. Our interest is in the degree of substitutability between labour inputs (young and old employees). We find evidence that both the introduction and the...