Edward Crenshaw is a doctoral candidate in the Department of Sociology at the University of North Carolina at Chapel Hill and holds a traineeshipat the Carolina Population Center. In addition to historical demography, his current research concerns the effect of economic and political systems on economic development.ABSTRACT: Research conducted on the historical demography of Western Europe contradicts the classic theory of demographic transition. Contrary to the emphasis on mortality in transition theory, work by Wrigley, Schofield, Goldstone, and others points to fertility in general, and age at marriage and the incidence of marriage in particular, as the critical determinants of population size, structure, and growth in the early modern period. Recent theories link occupational and industrial structures to the historical fertility regime of western Europe, and suggest that changes in economic structure rather than changes in economic rationality due to modernization dictated fertility patterns for this region during this historical era.