Final answer:
Changes in family structure, such as single-parent families and two-career high-earner couples, contribute to income inequality across households.
Step-by-step explanation:
Demographic changes, such as variations in income distribution, can have a significant impact on societies. One true statement regarding demographic changes and income distribution is that changes in family structure contribute to income inequality across households. For example, the growth of single-parent families, who tend to be at the lower end of the income distribution, and the growth of two-career high-earner couples near the top end of the income distribution, account for roughly half of the rise in income inequality.