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Question
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Economics 304
Homework #4 – Desired Capital, User Cost and Goods Market Equilibrium
Due Wednesday, 10/1 at the beginning of class – no late papers accepted!
Instructions: Please show all work or points will be taken off. Good luck!
1. PART 1 (35 points total – 5 points for each part and 10 points for the diagram) You own a golf course in Florida and you need to determine how many golf carts you need to buy to maximize profits. Please answer the following questions given the information below.
A brand new golf cart costs 300 rounds of golf and the rate of depreciation is 15% (.15).
The real interest rate is 5% (use .05 in calculations).
The expected marginal product of capital is given by MPKf = 200 – 5K.
a) What is the user cost of capital and what is it expressed in??
b) How many golf carts should you buy to maximize profits (i.e., what is K*)?
Draw a graph (the uc / MPK graph) depicting the state of affairs and label this initial profit maximizing point as point A.
A completely labeled and correct graph is worth 10 points.
c) Now suppose the (local) government with all their financial shortfalls embarks on a campaign to raise revenue to fund the fire department by imposing a so-called “luxury tax” (we know it as ?) equal to 25% of gross revenue What happens to the profit maximizing number of golf carts? Please show all work and label as point B on your uc/MPK graph.
d) Now explain why your profit maximizing K* has changed. Please be specific using the firm’s profit maximizing condition (explain the intuition!). Start your answer with “If I did not change my capital input (my K*), then I would not be …….(you can finish the rest!) ……………..”
e) The Federal government, knowing all about the financial pains encountered by state and local governments given the Great Recession, decide to offer an investment tax credit equal to 20% (this is in addition to the tax already imposed by the local government). What is your desired capital stock (K*) now? (Hint: An investment tax credit effectively reduces the price of capital to the firm – think of it as this – under the investment tax credit – you buy a golf cart (cost = 300 rounds of golf) and you get a 20% rebate from Uncle Sam so the investment tax credit adjusted price of the golf cart is now 240 rounds of golf [(1-.20) x 300 = 240]. Please show all work again and label this as point C on your uc/MPK diagram.
1. PART 2 (NEW GRADER – 35 points – 5 for f) and g) 10 for h) and 15 for graph)) Draw a desired investment diagram (completely labeled with all the shift variables noted next to the function in parentheses with signs (+ or -)) depicting the initial equilibrium as point A (simply draw a negatively sloped ID curve going through point A). Label the initial real interest rate as r*A= .05 (as is given above) and the initial level of desired investment as IdA. Note importantly that we do not have numbers for desired investment, but that’s ok, we are focusing on the change in desired investment, given the same real rate = .05. Be sure to include all ofthe shift variables in parentheses next to this initial ID function.
A completely labeled and correct graph is worth 15 points.
Then show, as point B, the new level of desired investment, at the same real rate = .05.
f) Why did the level of desired investment change, even though the real rate of interest did not? Please be specific using the equation that connects the desired capital stock (K*) to desired investment (as we did in class (equation 4.6…in text).
Label this (new) level of desired investment as IdB (again, we don’t have specific numbers for IdB. Be sure to include all ofthe shift variables in parentheses next to your new ID function
Finally, show how the investment tax credit maps to your desired investment diagram and label this final point as point C. Label this (new) level of desired investment as IdC (again, we don’t have specific numbers for IdC). Make sure you include all of shift variables in parentheses next to your new ID function.
g) Suppose that the Federal Reserve had a goal to get the capital stock (the number of golf carts purchased) back to its initial level as in part b (this would create jobs and get the economy back to full employment). Given all the changes (the imposition of the tax by the local government and the investment tax credit offered by the Federal Government), what would they have to do to the real rate of interest to achieve their objective? Please show all work and I am looking for a specific number (i.e., r = ?).
h) (10 points) Finally, explain how this most previous development (a change in r) would influence your two diagrams and why. Show on your two diagrams as point D. I am asking for a discussion for each diagram (this question is worth ten points!)
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