The primary term that determines how much economic value something had is scarcity
Answer:Professor Shapiro is supporting the activity theory
Explanation:
The activity theory which is also referred to as the implicit theory of aging states that of elders continue to engage themselves in social groups and activities this will result into optimum level of ageing.
This theory suggest that elders being constantly engaged in social activities will improve their life and slow down the rate of ageing.
It suggests that there is a positive correlation between satisfaction about one's own life and being socially active.
The Tigris River, The Ganges River, and The Indus.
