Final answer:
In Rostow's five-stage model of economic development, a country in Stage 5 purchases most of its highest-technology products and services from Stage 4, the drive to maturity.
Step-by-step explanation:
In Rostow's five-stage model of economic development, a country in Stage 5, also known as the age of high mass consumption, purchases most of its highest-technology products and services from Stage 4 (the drive to maturity). In Stage 4, countries have urbanized and industrialized, and their populations resemble a stationary population pyramid. They have a high level of growth in the industrial and service sectors, creating a need for infrastructure. These countries often have a strong consumer economy and are able to produce or import high-technology products and services.