Answer the following statement(s) true (T) or false (F)

1. In a model that analyzes the effects of a tax change, the tax serves as an endogenous variable.
2. The embarrassment theory suggests why shopping carts should be smaller.
3. An economic model, even if unrealistic, is useful as long as it makes predictions that are realistic.
4. Efficiency is the only criterion by which economists judge policies.
5. All points on a risk-neutral individual's indifference curve have the same expected value.

1. False
2. False
3. True
4. False
5. True