In the 1960s and 1970s, of the three components of population change, fertility, mortality, and mobility, fertility was the primary focus of demographic research. This was prompted by the belief that fertility is the most problematic component of population change, in regard to both understanding why it changes when it does and identifying ways to influence its changing pace. Also, it was recognized that the consequences of fertility trends are far more serious than those of the most likely trends in mortality or migration. For example, fertility has more serious consequences to the age structure of national populations than mortality or migration.
KeywordsTotal Fertility Rate Birth Interval Fertility Decline Fertility Level Family Planning Program
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