Question

incentives
a primary principle of economics is that humans respond to incentives. incentives are the rewards that encourage specific actions.
a primary principle of economics is that humans respond to which of the following?
incentives
morality
weather

Explanation:

The provided text explicitly states that a primary principle of economics is that humans respond to incentives, which are rewards encouraging specific actions. The other options (morality, weather) are not identified as this core economic principle.

Answer:

incentives