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Alice has utility from hours of TV and hours of movies given by U (t, m) =5t + 4m.(a) Obtain the equation of the indifference curve for the utility level U = 100 (set min the vertical axis).(b) Draw three indifference curves for Alice, and label the levels of utility that theycorrespond to (you can choose the utility levels that you want). Set m in thevertical axis and t in the horizontal axis.(c) What is Alice’s marginal rate of substitution M RS? Hint: Adopt the conventionof treating t as x and m as y.(d) If Alice’s income is $50, and the price of movies is $2 per hour and the price ofTV is $1 per hour, how much of each will she consume?(e) What if the price of movies is $1 per hour and TV is $2 per hour?(f) Obtain the equation of the indifference curve for the utility level U = 20 (set min the vertical axis). Is this indifference curve steeper than the indifference curveyou derived in part (a)? Explain.3

Question

Alice has utility from hours of TV and hours of movies given by U (t, m) =5t + 4m.(a) Obtain the equation of the indifference curve for the utility level U = 100 (set min the vertical axis).(b) Draw three indifference curves for Alice, and label the levels of utility that theycorrespond to (you can choose the utility levels that you want). Set m in thevertical axis and t in the horizontal axis.(c) What is Alice’s marginal rate of substitution M RS? Hint: Adopt the conventionof treating t as x and m as y.(d) If Alice’s income is 50,andthepriceofmoviesis50, and the price of movies is 2 per hour and the price ofTV is 1perhour,howmuchofeachwillsheconsume?(e)Whatifthepriceofmoviesis1 per hour, how much of each will she consume?(e) What if the price of movies is 1 per hour and TV is $2 per hour?(f) Obtain the equation of the indifference curve for the utility level U = 20 (set min the vertical axis). Is this indifference curve steeper than the indifference curveyou derived in part (a)? Explain.3

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Solution

(a) The utility function is given by U(t, m) = 5t + 4m. To obtain the equation of the indifference curve for the utility level U = 100, we set U(t, m) = 100 and solve for m:

5t + 4m = 100 4m = 100 - 5t m = 25 - 1.25t

(b) To draw the indifference curves, we need to choose different utility levels. Let's choose U = 80, U = 100, and U = 120. The equations of the indifference curves are:

For U = 80: m = 20 - 1.25t For U = 100: m = 25 - 1.25t For U = 120: m = 30 - 1.25t

(c) The marginal rate of substitution (MRS) is the negative of the ratio of the marginal utility of t to the marginal utility of m. The marginal utility of t is 5 and the marginal utility of m is 4, so the MRS is -5/4 = -1.25.

(d) If Alice's income is 50,thepriceofmoviesis50, the price of movies is 2 per hour and the price of TV is $1 per hour, she will consume the goods according to her budget constraint, which is 50 = 2m + t. Solving this equation for m, we get m = 25 - 0.5t. Setting this equal to the equation of the indifference curve and solving for t, we get t = 20 hours. Substituting this into the budget constraint, we get m = 10 hours.

(e) If the price of movies is 1perhourandTVis1 per hour and TV is 2 per hour, the budget constraint is 50 = m + 2t. Solving this for m, we get m = 50 - 2t. Setting this equal to the equation of the indifference curve and solving for t, we get t = 10 hours. Substituting this into the budget constraint, we get m = 30 hours.

(f) The equation of the indifference curve for the utility level U = 20 is m = 5 - 1.25t. This indifference curve is steeper than the indifference curve for U = 100 because the absolute value of the slope (1.25) is greater. This means that Alice is willing to give up more movies for an additional hour of TV when her utility is lower.

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