Final answer:
The best indicator of economic growth in communities since 1980 is the overall level of educational achievement, as it contributes to a skilled workforce and drives development.
Step-by-step explanation:
The single best indicator of which communities enjoyed the greatest rates of economic growth since at least 1980 is the overall level of educational achievement. This is supported by research indicating that higher levels of education in a community are linked to higher economic growth and development. While factors such as crime rates, the number of new houses built, and the number of new businesses created can have an impact on economic growth, educational achievement is a fundamental factor that contributes to a productive, adaptable, and innovative workforce, which, in turn, is a strong driver of economic development and growth.