@inbook{Wahl1992, author = {Wahl, J.B. }, title= {Trading quantity for quality. Explaining the decline in American fertility in the nineteenth century}, year = {1992}, editor = {Goldin, C.}, editor = {Rockoff, H.}, booktitle = {Strategic Factors in Nineteenth Century American Economic History: A Volume to Honor Robert W. Fogel}, address = {Chicago}, publisher = {University of Chicago Press}, pages = {375--397}, }