# Econ306 Intermediate Microeconomics Fall 2007 Midterm exam Solutions

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1 Econ306 Intermediate Microeconomics Fall 007 Midterm exam Solutions Question ( points) Perry lives on avocado and beans. The price of avocados is \$0, the price of beans is \$, and his income is \$0. (i) (3 points) Show Perry s budget line on a graph with avocados on the horizontal axis and beans on the vertical axis. Calculate the intercepts with the two axes and the slope of the budget line. Answer: If Perry spent all his income on avocados, he could buy 0 = avocados; if he 0 spent all his income on beans, he could buy 0 = 8 beans. These are the two intercepts of the budget line. The slope of the budget line is given by the negative of the price ratio: 0 =. The budget line will look like in the graph below. Beans 8 Avocados

2 (ii) (3 points) Draw another budget line showing what Perry s budget would be if his income doubled, the price of avocados doubled, and the price of beans stayed the same. Calculate the intercepts with the two axes and the slope of this new budget line. Answer: In this case, Perry s income becomes 0 = \$80 and the price of avocados is \$0. If Perry spent all his new income on avocados, he could buy 80 = avocados, again; 0 if he spent all his income on beans, he could now buy 80 budget line is 0 = 6 beans. The slope of the new =. The new budget line will look like in the graph below. Beans 6 Avocados (iii) (6 points) If Perry s income stayed the same at \$0, which price or prices should change and by how much in order for him to face the same budget constraint as in the previous question? If the good(s) whose price changed are normal, show on the graph the substitution and the income effects and explain how the quantity consumed of the good(s) changed. Answer: In order to better answer this question, draw the two budget lines together on the same graph. It becomes clear now that the second budget line could have been the result of a fall in the price of beans (to be more precise, for Perry to afford a maximum quantity of 6 beans when his income is still \$0, the price of beans must have fallen to 0 6 = \$.). In this case, the substitution effect and income effect are measured on the vertical axis, the axis that represents beans. The substitution effect (shown in the second graph as the move from point to point ) pushes Perry to consume more beans, since they became

3 Beans 6 8 Avocados cheaper. As Perry can afford the same quantity of beans as before, but while spending less, he feels as if he has more money and as such can afford to buy more beans (because beans are a normal good). This is the income effect, shown in the graph as the move from point to point 3. Beans Avocados 3

4 Question (0 points) Max has the utility function U(x, y) = x(y + ). The price of x is \$ and the price of y is \$. Income is \$0. (i) (3 points) Derive the marginal utility of both goods. Answer: The marginal utility of a good is the derivative of the utility function with respect to the quantity of that good consumed: MU x = MU y = U(x, y) x U(x, y) y = y +, = x. (ii) ( points) Find the optimal consumption bundle: how much x and how much y does Max demand? What is the marginal rate of substitution at the optimum? Answer: At the optimal consumption bundle, the ratio of the marginal utilities is equal to the ratio of the corresponding prices: MU x = p x y + MU y p y x = y + = x y = x. We also know that Max spends all his income on consumption, so the budget constraint must hold: p x x + p y y = I x + y = 0. Substituting for y in the equation above yields: x + (x ) = 0 x = 0 x = x = =.7. Now we can calculate the optimal quantity of good y: y = x =.7 =.. Hence, the optimal consumption bundle consists of.7 units of good x and. units of good y. (iii) (3 points) If his income doubles and prices stay unchanged, will Max s demand for both goods double? Answer: When income doubles, the only change in the analysis above is in the budget constraint: p x x + p y y = I x + y = 0.

5 We can again substitute for y in the budget constraint: x + (x ) = 0 x = 0 x = x = =.. Now we can again calculate the optimal quantity of good y: y = x =. = 9.. Note that the doubling of the income lead to a less than double optimal quantity of good x, but to a more than double optimal quantity of good y. Question 3 (0 + extra points) Patience has a utility function depending on her consumption today c 0 and on her consumption tomorrow (next period) c. She will earn 00 units of consumption in each period (i.e., I 0 = I = 00). She can borrow or lend at an interest rate of 0%. (i) ( point) Write down her intertemporal budget constraint. Answer: The intertemporal budget constraint is c 0 + c + i = I 0 + I + i c 0 + c. = c 0 + c. = (ii) (3 points) Calculate the intercepts of the budget line with the horizontal (consumption today) and with the vertical (consumption tomorrow) axes, as well as the slope of the budget line. Answer: If Patience spent all her income on consumption today (c = 0), she would be able to afford 90.9 units of consumption. If she spent all her income on consumption tomorrow (c 0 = 0), her consumption would be given by c. = 90.9 c = = 0. The slope of the intertemporal budget constraint is given by the negative of ( + i), and so it is.. (iii) ( point) Graph the budget line, making sure to emphasize her endowment point. Answer: The endowment point represents her affordable consumption if she neither saves nor borrows. In that case, c 0 = I 0 = 00 and c = I = 00.

6 c 0 00 Endowment point c 0 (iv) ( points) Suppose that Patience chose to consume units of consumption today. How would she be affected by a drop in the interest rate from 0% to 7.%? Make sure to describe the substitution and the income effects. Answer: A ( drop in) the interest rate is equivalent to an increase in the price of future consumption. In this case, the substitution effect implies that she would consume + i less in the future, because it is more expensive, and more today. This in turns pushes Patience to save less. In order to determine the income effect, we need to figure out if Patience is a saver or a borrower. Since she consumes today less than her income ( < 00), she is a saver. In this case, the lower interest rate means that she will receive less in the future as interest payments and she is negatively affected (has less money). As a result, she will lower her consumption both today and tomorrow and save more. The final effect of the drop in the interest rate depends on which of the two effects dominates. If the substitution effect is stronger, then she will end up saving less. If the income effect is stronger, then she will save more. (v) (extra points) Suppose Patience s utility function is of the form U(c 0, c ) = c 0 + c = c / 0 + c /. What is the marginal utility of consumption today and of consumption tomorrow? Calculate the optimal allocation of consumption between the two periods (i.e., c 0 and c ). 6

7 Answer: The two marginal utilities are calculated as the derivative of the utility function with respect to the two types of consumption, today and in the future: MU 0 = U(c 0, c ) c 0 = c 0, MU = U(c 0, c ) c = c = c. Next, remember the ratio of the marginal utilities is equal to the ratio of the prices at the optimal consumption point. The price of c 0 is equal to and the price of c is + i. Then, MU 0 = c 0 = MU +i c c = + i c +i 0 =. c 0 c = c 0. c =. c 0 c =. c 0 c =.8c 0. c Now we can substitute for c in the budget constraint to find the value of c 0 : c 0 + c. = 90.9 c 0 +.8c 0 = 90.9 c 0 +.c 0 = c 0 = 90.9 c 0 = 90.9 = Finally, we can now calculate the optimal consumption in the future: c =.8c 0 = = 7.. Question (0 points) Beth works for the federal government and her job is to analyze the market for oranges. (i) ( points) Suppose she found that the demand function is Q = 0 p, where Q is the quantity of oranges demanded and p is the ongoing price per pound. Graph the demand curve (remember to label the intercepts). Answer: When the price of oranges is zero, total demand is Q = 0. When total demand is zero, the price is 0 = 0. The demand curve then looks like in the graph below. 7

8 P 0 0 Q (ii) ( points) The federal government is considering imposing some restrictions on the production of oranges because of environmental concerns. The current price is \$ per pound, but after the restrictions it would increase to \$ per pound. What is the consumer surplus before and after the restrictions? What is the loss in consumer surplus due to the restrictions? If a consumer advocacy group would try to bribe Beth to convince federal authorities that the restrictions should not be imposed, how much would they be willing to spend? Answer: When the price is p 0 = \$ per pound, the quantity demanded is Q 0 = 0 = 30 and the consumer surplus equals the area of the corresponding triangle: CS 0 = 6 30 = \$90. When the price increases to p = \$ per pound, the quantity demanded is Q = 0 = and the consumer surplus is CS = = \$6.. Consumers then experience a loss of CS = CS CS 0 = = \$7.. Hence, they will be willing to bribe Beth up to \$7. (the shaded area in the graph below) to prevent the restrictions from being imposed. P Q 8

9 (iii) ( points) Now suppose that Beth does not know the demand function, but she observed that when the price of oranges grew from \$ to \$.0 per pound, the quantity of oranges demanded fell from 30 to 9 pounds. What is the point elasticity of demand? Using this estimate, by how much would demand decrease if the government were to impose the quantity restrictions and raise the price from \$ to \$ (a % increase in the price)? Answer: To answer this question, remember that the elasticity of demand shows the percentage change in demand due to a % change in price. So Beth first needs to calculate the (point) elasticity of demand using the information she already has (as in the lecture notes, I will used X to denote quantity demanded). The change in quantity demanded is X = 9 30 = and the change in price is p =.0 = 0.0. The elasticity of demand is then ɛ = %X %p = X p p X = =.67. So, when price changes by %, quantity demanded changes by.67%. In the case of the quantity restrictions, the price increases by %. This implies that quantity demanded will fall by.67 = 66.67% to 0 pounds. (iv) ( points) After sitting in Econ306, Beth learned that you need to use the arc elasticity of demand for large price changes. She knows that, on year ago, when the price of oranges fell from \$ to \$3 per pound, the quantity demand increased from 30 to 0 pounds. What is her estimate of the arc elasticity? Using this estimate, what is the effect of the government restrictions on the demand for oranges? Answer: For the arc elasticity, we need to calculate the changes in price and quantity demanded as well as the average price and quantity demanded: X = 0 30 = 0, X = = 0, p = 3 =, p = + 3 = 3.. The arc elasticity of demand is then ɛ a = X p p X = =.7. Therefore, if the price changes by %, quantity demanded changes by.7%. In the case of the quantity restrictions, when the price increases by %, quantity demanded will fall by.7 = 3.7% to 6.87 pounds. Question (8 points) Joanne has a beauty salon and she makes \$, 000 a month. Despite her uncontested talent, she tends to be absent minded at times. As a result, there is a 0% chance each 9

12 Dimes 3 Dollar bills Finally, note that he will be able to buy only one soda with dollar bills and 3 dimes, meaning that the indifference curves are rather areas : all the points between two indifference curves (given by an integer number of sodas he can buy) give him the same level of satisfaction as the points on the lower curve.

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