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Consider an individual whose utility function over income I is U(I), where U is increasing smoothly
in I and is concave (in other words, our basic assumptions throughout this chapter). Let IS = 0 be
this persons income if he is sick, let IH > 0 be his income if he is healthy, let p be his probability of
being sick, let E[I] be expected income, and let E[U] be his expected utility when he has no
insurance.
a Write down algebraic expressions for both E[I] and E[U] in terms of the other parameters of the
model.
b Consider a full insurance product that guarantees this individual E[I]. Create a diagram in UI
space. Draw the individuals utility curve and the lines represent- ing IS, IH , and E[I]. Then draw
and label a line segment that corresponds to the utility gain, U, from buying this insurance product.
Draw and label another line segment, M, which corresponds to the consumer surplus from the
purchase of insurance (that is, the monetary value of the utility gain from buying insurance).
c Derive an algebraic expression for M. [Hint: you may assume that U is invertible and its inverse
is U1].
d Draw a graph plotting how M changes as p (the probability of being sick) varies between 0 and
1. [Hint: draw a coordinate plane with p on the x-axis and M on the y-axis.] Describe intuitively why
this graph has the shape that it does.

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Consider an individual whose utility function over income I .pdf

  • 1. Consider an individual whose utility function over income I is U(I), where U is increasing smoothly in I and is concave (in other words, our basic assumptions throughout this chapter). Let IS = 0 be this persons income if he is sick, let IH > 0 be his income if he is healthy, let p be his probability of being sick, let E[I] be expected income, and let E[U] be his expected utility when he has no insurance. a Write down algebraic expressions for both E[I] and E[U] in terms of the other parameters of the model. b Consider a full insurance product that guarantees this individual E[I]. Create a diagram in UI space. Draw the individuals utility curve and the lines represent- ing IS, IH , and E[I]. Then draw and label a line segment that corresponds to the utility gain, U, from buying this insurance product. Draw and label another line segment, M, which corresponds to the consumer surplus from the purchase of insurance (that is, the monetary value of the utility gain from buying insurance). c Derive an algebraic expression for M. [Hint: you may assume that U is invertible and its inverse is U1]. d Draw a graph plotting how M changes as p (the probability of being sick) varies between 0 and 1. [Hint: draw a coordinate plane with p on the x-axis and M on the y-axis.] Describe intuitively why this graph has the shape that it does.