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This article compares the declines in fertility in Europe and the Third World. Lower levels of fertility were largely due to the adoption of innovative behavior within marriage. So far this transformation of reproduction has been monotonic and rapid. Socioeconomic development is associated with the timing of the onset of the transition and is responsible for differences among groups during the transition, although it is not yet possible to rule out alternative explanations such as ideational or institutional change The pace and pervasiveness of the declines, however, suggest that a mechanism of diffusion is involved. [ABSTRACT FROM AUTHOR]