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4. Suppose a consumer has perfect substitutes preference such that good x1 is twice as valuable...

4. Suppose a consumer has perfect substitutes preference such that good x1 is twice as valuable as to the consumer as good x2.

(a) Find a utility function that represents this consumer’s preference.

(b) Does this consumer’s preference satisfy the convexity and the strong convex- ity?

(c) The initial prices of x1 and x2 are given as (p1, p2) = (1, 1), and the consumer’s income is m > 0. The prices are changed, and the new prices are (p1,p2) = (4,1). Decompose the changes of the demand of x1 into substitution effect and income effect.

(d) Draw indifference curves and budget lines to show the substitution effect and income effect in a diagram.

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