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Suppose now June can purchase insurance for the transport of her householde§ects at a price of q 2 (0; 1) per dollar of coverage. That is, if she chooses apolicy that covers a maximum of C in the event of a loss, she pays qC to theinsurance company and they agree to pay her in the event of a loss, the valueof her loss up to the agreed maximum cover of C. So, in particular, if she3takes out a policy with the maximum coverage of L, then she will be fullyinsured in the event of the truck crashing since her state-contingent wealthwill be M qL in the event the truck does not crash and M qL L + L =M qL in the event the truck crashes.(d) (5 points) Illustrate on your diagram from part (a) her state-contingentwealth bundles corresponding to the set of choices going from zero cov-erage (that is, C = 0) to full coverage (that is, C = L). [Hint: eachadditional dollar of coverage reduces Juneís wealth by q dollars in theevent the truck does not crash and increases it by q + 1 in the eventthe truck crashes.]

Question

Suppose now June can purchase insurance for the transport of her householde§ects at a price of q 2 (0; 1) per dollar of coverage. That is, if she chooses apolicy that covers a maximum of C in the event of a loss, she pays qC to theinsurance company and they agree to pay her in the event of a loss, the valueof her loss up to the agreed maximum cover of C. So, in particular, if she3takes out a policy with the maximum coverage of L, then she will be fullyinsured in the event of the truck crashing since her state-contingent wealthwill be M � qL in the event the truck does not crash and M � qL � L + L =M � qL in the event the truck crashes.(d) (5 points) Illustrate on your diagram from part (a) her state-contingentwealth bundles corresponding to the set of choices going from zero cov-erage (that is, C = 0) to full coverage (that is, C = L). [Hint: eachadditional dollar of coverage reduces Juneís wealth by q dollars in theevent the truck does not crash and increases it by �q + 1 in the eventthe truck crashes.]

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Solution

To illustrate June's state-contingent wealth bundles corresponding to the set of choices going from zero coverage to full coverage, follow these steps:

  1. Start by drawing the same graph as in part (a), with x1 (wealth if the truck does not crash) on the horizontal axis and x2 (wealth if the truck crashes) on the vertical axis.

  2. Plot the point representing zero coverage. This is the same as the point in part (a), with x1 = M and x2 = M - L.

  3. Now consider the case of full coverage, where C = L. In this case, June pays qL to the insurance company. If the truck does not crash, her wealth is M - qL. If the truck crashes, the insurance company pays her L, so her wealth is M - qL + L = M - qL. Plot this point on the graph with x1 = M - qL and x2 = M - qL.

  4. The line connecting these two points represents June's state-contingent wealth bundles as she varies her insurance coverage from zero to full. Each additional dollar of coverage reduces June's wealth by q dollars if the truck does not crash (moving left along the x1 axis) and increases it by (1-q) dollars if the truck crashes (moving up along the x2 axis).

  5. The slope of this line is (1-q)/q. This represents the trade-off June faces between wealth in the two states as she changes her insurance coverage. The steeper the line, the higher the price of insurance (q), and the less attractive insurance becomes to June.

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