These two factors gave rise to a high relative income, which encouraged high fertility. Following this period, the next generation had a greater desire for material objects, however, an economic slowdown in the United States made jobs harder to acquire. This resulted in lower fertility rates causing the Baby Bust.
High relative income due to these two factors encouraged high fertility. However, after this period, the subsequent generation desired more material possessions. Simultaneously, a slowdown in the U.S. economy made job acquisition harder. As a result, lower fertility rates occurred, leading to what is known as the Baby Bust.