The dynamics of population growth differential fertility and inequality: note.
This note challenges the proposition David Lam made in his attempt to examine the relationship between population growth and the distribution of income. In the first 2 sections of his paper in which no income mobility was allowed Lam successfully analyzed the effects of adding to the economy a group of immigrants (with income distribution different from the original residents) on 2 inequality measures. In the 3rd section Lam made the strong proposition that claims in effect in order to determine whether an increase in the ith-income groups fertility would increase or reduce the steady-state proportion of the ith-income group all the information needed is the ith row of the mobility matrix. A counterexample is presented here along with a correction for the error that is made in the derivation of Lams proposition.
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