Technical progress where with any given factor proportions the average and marginal products of all factors increase in the same proportion. Thus if Y = F(K, L), where Y is output, K is labour, and L is capital, and the function F(K, L) has constant returns to scale, output after Hicks-neutral technical progress where the productivity of each factor rises to λ > 1 times its former level is given by
See also Harrod-neutral technical progress.