Intermediate Microeconomics · free preview

Contingent Consumption and Insurance Budgets

Uncertainty turns consumption into state-contingent bundles, the insurance market prices the states through odds, and the budget line through the endowment has slope minus the loss probability over the no-loss probability at fair rates.

1. Consumption with a state label

Consumption with a state label

2. Fair odds

Fair odds

3. Unfair odds and no insurance

Unfair odds and no insurance

4. The state-price logic

The state-price logic

5. The endowment

Wealth 1000, loss of 400 with probability one quarter. What is the contingent consumption endowment?

6. The fair slope

At fair odds with loss probability one quarter, what is the budget slope and its meaning?

7. Full coverage arithmetic

Buying full coverage K of 400 at the fair premium rate 0.25, what bundle results?

8. Loaded premiums

An insurer charges 0.35 per dollar of coverage instead of the fair 0.25. What happens to the budget and to full coverage?

9. The fair premium

With loss 400 at probability 0.25, compute the actuarially fair premium for full coverage, and write the number.

10. Net payout in the bad state

Same full coverage, compute the net addition to bad-state consumption, and write the number.

11. The loaded slope

At a premium rate gamma of 0.35, what is the slope of the contingent budget line?

12. Full coverage at the loaded rate

Buying full coverage K of 400 at gamma 0.35, which bundle results?

13. Insurance as the mean

At fair odds, full coverage converts the 1000-or-600 gamble into a certain 900. What is 900?

14. The building block of insurance

Finance calls a dollar delivered only in the bad state an Arrow security. How does insurance relate to it?

15. The loaded slope's magnitude

At gamma of 0.35, compute the magnitude of the budget slope, one minus gamma over gamma, rounded to two decimals, and write the number.

16. The bad state under loaded full coverage

At gamma of 0.35 with full coverage, the good state lands at 860. Compute the bad state's consumption, and write the number.

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