Final answer:
The proportion of elderly citizens in the United States population is projected to increase, leading to a greater demand for products and services for senior adults. Conversely, there will be a decrease in the demand for products for young children.
Step-by-step explanation:
The proportion of elderly citizens in the United States population is projected to increase from 9.8% in 1970 to 20% by 2030. This means that senior adults (65 and older) are growing at a faster rate compared to children under the age of five. As the population ages, there will be an increased demand for products and services that cater to the needs of senior adults, such as nursing homes and hearing aids.
On the other hand, the demand for goods and services targeting children under the age of five, like tricycles and day care facilities, will decrease relative to the demand for products for senior adults.
Overall, the aging population will lead to an increased demand for products and services related to senior care and healthcare, while the demand for products for young children will not grow as rapidly.