Throughout this problem set, let X = R2, and suppose a consumer faces a price vector p = (P1, P2) and has an income m, where P1, P2, m > 0. In different questions, we will make different assumptions about what the consumer's utility u: X → R looks like. Throughout, let r* € R2 be the consumer's chosen bundle.
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- 1 Consider a consumer who consumes only two goods, 21 and z2. His utility function is u (21, 22) = In z1 + 2. where In represents the natural logarithm. 1.a Derive the consumer's MRS of good 1 for good 2 using calculus to calculate his marginal utility from z and his marginal utility from z2. 1.b If the price of z1 is $2 per unit and the price of z2 is $4 per unit, and the consumer's income is $100, What is the equation of this consumer's budget line? 1.c What are the optimal consumption choices, z and z5, for this consumer? Show your work.Show whether or not the following utility functions are monotonic transformation of each other u = X,X2: u = lnX,lnX, %3! u = X, + X2: u = (X, + X,) u = X, + X2: u = (X1 + X2)? Show whether or not the following utility functions are convex U = x,°X, U = x, + X,2 U = X, + X,X2X2. Consider an individual who not only consumes goods x and y, but also needs a mini- mum amount of x = xo to survive. Her (Stone-Geary) utility function is given by U(x, y) = (x — xo)¹/²y¹/² Let prices be pa, Py and income is I > Pro. (a) Show that this individual maximizes utility by spending (I-Pro) + Pro on good rand(I - Pro) on good y. Provide an economic interpretation for this result. [Hint: It might help to define z = x - xo and I = I - Pro. Then find the optimal z (and therefore x = z + xo) and y]
- 2 COOKIES AND TEA Consider a consumer, Jennie, who only consumes tea (t) and cookies (c). Jennie's utility func- tion is U(t, c) = min{5t, c}. The min function gives you the smaller of the two arguments.¹ For example, the min{1,3} = 1 since 1 is less than 3. She has $10 to spend, the price of a cup of tea is normalized to $1, and the price per cookie is $2. Assume she can buy tea and cookies in fractions. a. Graph the set of the tea and cookie pairs that yield the utility level of 5 with tea on the x-axis and cookies on the y-axis. Now graph an indifference curve associated with the level of utility equal to 7. b. Given the market prices that Jennie faces and her income, how much tea and how many cookies will Jennie choose to consume? Show her optimal choice graphically with cookies on the x-axis and tea on the y-axis. [Note: You cannot use the standard Lagrangian technique here because the slope of the indifference curve is not defined at the kink. Try working with the graph of the…We are told that Alfonso is a rational consumer, but we do not have much information about his preferences for Olives (good 1) and pickled onions (good 2). Suppose we observe that when the prices p1=p2=1 and his income is M=2, he chooses the bundle (1,1). Now we suppose we are told that p1 has decreased, that p2 has remained the same, and that Alfonso's income has been modified so that his initially chose bundle (1,1) is just affordable. Show that at his chosen bundle Alfonso consumes more Olives.Consider a consumer with M = $120 to spend (income) and faces prices PX = $15 and PY =$5 for goods X and Y. Her utility function is U(X, Y) = X1/2 + Y1/2.a Carefully. express the consumer’s choice problem, using the given information (this is whereyou write out the max operator, the choice variables, the objective function, and the budget constraint). b. Compute the absolute value of the consumer’s marginal rate of substitution, and inspect it todetermine the shape of the consumer’s indifference curves: C-shaped, linear, )-shaped, or some other shape.To show your work, neatly use the arrow argument, increasing X (↑) and decreasing Y (↓) to see whether|MRS(X, Y)| is diminishing along an indifference curve. c. If the indifference curves are C-shaped write out the budget line and the equal slopes conditionthat characterize an interior solution to the consumer’s choice problem. Use the particulars for the givenconsumer. Solve these conditions to find the interior solution. On the other…
- A consumer’s preferences over pizza (x) and steak (y) are given by u(x,y) = x2y (HINT: MUx = 2xy and MUy = x2) and his income is I = $120 and py = $1. (a) Calculate his optimal bundle when pX = $8 (call this bundle A) and separately when pX = $1 (call this point C). (b) Finding the decomposition bundle B, calculate the income and substitution effects on the amount of pizza of a decrease in the price of pizza from pX = $8 down to pX = $1. (c) Forget about the decomposition bundle and the two effects. In (a), the price of pizza decreases, hence the agent ends up better off. Let’s quantify how much “better off” the agent becomes after this price drop, in dollars. For this, instead of the price drop, suppose the agent is given some money $m and he optimize utility with this additional gift included to his budget. What should m be, so that his optimal utility with his expanded budget is exactly equal to his utility at the bundle C (the bundle he chooses optimally when pizza price drops to…1. Consider a consumer who consumes two goods. The utility function is given by u(x1, x₂) /2x1+1+√√√x₂, - where x > 0 denotes the amount of good i = the price of good 1 is 3, the price of good 2 is p2 > 0, and the income is 12. 1,2 consumed. Unless stated otherwise, (1) Calculate the marginal rate of substitution (measuring the value of good 1) at the consumption plan (x₁, x₂) = (3, 4). (2) Calculate the consumption plan that is optimal for the consumer. (3) Let v(p₂) denote the utility level at the optimal consumption plan. Calculate its derivative with respect to p2, i.e., v'(P2), at p2 = 3. (4) Suppose that p2 = 1 and the utility level is 10. Calculate the compensated demand for each good.1. Suppose that U (f,c) = f + 8c² is a utility function that describes Amelia's preferences over two goods: fish (f) and custard (c). For the following, think of fish as the good graphed on the horizontal axis. Derive an expression for her marginal utility (Uf) from a small increase in f holding c fixed. Also find the marginal utility for custard (U.). b. What is Amelia's marginal rate of substitution (MRS)? Give a brief (2 sentences maximum) intuitive description of what MRS represents. If Amelia has 4 units of custard, holding her utility constant, how many units of custard would she be willing to give up in order to get one more unit of fish? c. Graph Amelia's indifference curve for a utility level of 40. Be sure to specify at least 3 bundles of goods on the indifference curve. d. Does the fact that Amelia's indifference curve intersects with the custard axis violate any of the 5 properties of indifference curves? Briefly support your answer. a. Give another utility function that…
- Suppose a consumer’s utility function is u = x_1^(3/2) x_2^(3/2) . She spends her budget of £27 for two goods. The prices of both goods are p1 = 6 and p2 = 6 Now suppose that instead both goods are priced as follows: There is a discount of 50% on the price of good 1 on each additional unit in excess of 3 units, and there is a discount of 50% on the price of good 2 on each additional unit in excess of 3 units. Draw the new budget constraint and derive it analytically.Let the following table represents the total utility of a given consumer, in the cardinal utility approach. Q 1 2 3 4 5 Tux 8 14 18 20 20 Tuy 6 10 13 15 16 Mux Muy Mux/px Muy/py D) Assuming the consumer has any amount of money (enough budget) how many of X and Y should the consumer buy, to maximize utility? E) What is the total utility of X and Y? F) Let now price of X is 4 birr per unit and price of Y is 2 birr per unit and budget of the consumer for consumption of X and Y is 20 birr. Given budget constraint how many of X and Y should the consumer buy to maximize utility? G) What are the total utility of X and YKrissy spends all her income on holiday lights (L) and fishing bait (B). Lights are priced at $2, while a pack of bait costs $1. Assume that Krissy has $30 to spend and her utility function can be represented as: U(L,B) = L²B² with: MU=2LB² and MU=2L²B (Assume B is on the y-axis when graphing). How much utility does Krissy obtain from the optimal bundle? Note: enter number(s) only and convert any fraction to a decimal.