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…showed last 75 words of 673 total…have taken place that tends to provoke differences in household incomes. For example, divorces and separations, births out of wedlock, and the increasing age at first marriage have led to a shift away from married-couple households and toward single-parent and non-family households, which typically have lower incomes. Also, the increasing tendency over the period for men with higher-than-average earnings to marry women with higher-than-average earnings has contributed to widening gap between high-income and low-income households.