Economics 101 Fall 2011 Answers to Homework #5 Due 11/17/11 Directions: The homework will be collected in a box before the lecture. Please place your name, TA name and section number on top of the homework (legibly). Make sure you write your name as it appears on your ID so that you can receive the correct grade. Please remember the section number for the section you are registered, because you will need that number when you submit exams and homework. Late homework will not be accepted so make plans ahead of time. Please show your work. Good luck! Please realize that you are essentially creating “your brand” when you submit this homework. Do you want your homework to convey that you are competent, careful, professional? Or, do you want to convey the image that you are careless, sloppy, and less than professional. For the rest of your life you will be creating your brand: please think about what you are saying about yourself when you do any work for someone else! 1) Consider the budget line depicted below: a) What is the price of good A? b) What is the price of good B? c) Write the equation of the line in slope-intercept form. What is the slope of the budget line? d) How is the slope of the budget line related to the ratio of the two prices?2) Suppose Mike Myers consumes only leather jackets and guitars. He has an income of $10,000. Jackets cost $400 each, while the price of guitars is $2,000 each. On a separate graph for each part below show how each of the following changes affects Mike’s budget line. On your graphs, put jackets on the horizontal axis and guitars on the vertical axis. Label your graphs carefully and completely. On your graphs show the initial budget line, BL1, as well as the new budget line, BL2. a) Due to an increase in sales of Mini-Me dolls, Mike’s income increases by 20%. b) Due to the eminent retirement of Eric Clapton, the price of guitars increases by $500 each, (even the unsigned ones). c) Mike’s income increases by 20%, the price of guitars increases by $1,000, and the price of jackets decreases by $100, all at the same time. 3) This exercise will sharpen your skills with income and substitution effects. Draw a preliminary graph with whippers on the y-axis and snappers on the x-axis. On this graph include a generic budget line and a set of normal indifference curves that are downward sloping and bowed in (convex) toward the origin (convex). For each of the following situations, redraw the preliminary graph you’ve just designed and as explicitly as possible demonstrate the following changes. (HINT: you will need to adjust your indifference curves in order to illustrate the following scenarios!) On your graphs you will want to indicate the size and direction of the income and substitution effects as well as the location of the intermediate point (Professor Kelly refers to this as “Point C” in her examples) used to calculate the income and substitution effects. a) Price of whippers decreases, both whippers and snappers are normal goods b) Price of whippers increases, whippers are a normal good, snappers are inferior c) Price of snappers increases, whippers are normal and snappers are inferior goods d) Price of snappers increases, both whippers and snappers are normal goods 4) Consider the market for light bulbs. Write your own (linear) demand equation for light bulbs (Q) as a function of income, price of light bulbs & the price of lamps. It should satisfy the law of the demand, but other than that you are free to exercise your creativity. Hint: there are an infinite number of possible equations-your equation will likely be different from other students’ equations. Use this equation to answer the following questions: a) What is the income elasticity of demand for light bulbs? What does that tell you? (Hint: to find the income elasticity of demand for light bulbs, use the point elasticity formula but modify it to consider the relationship between income and quantity rather than price and quantity.) b) What is the cross-price elasticity of demand for light bulbs (with respect to lamps)? What type of good are light bulbs? (Hint: to find the cross-price elasticity of demand for light bulbs with respect to lamps use the point elasticity formula but modify it to consider the relationship between the price of lamps and the quantity of light bulbs rather than the relationship between the price of light bulbs and the quantity of light bulbs.)5) Use the following information to answer the next four questions: The following table gives cost information for a firm. Assume that labor is paid a constant wage, i.e. our firm is a price-taker in the labor market. L K Q MPL VC FC TC AVC AFC ATC MC 0 6 0 --- --- --- --- --- 1 6 1 16 2 6 3 4 3 6 10 4 6 15 5 6 17 6 6 18 a) Complete the table with specific values. b) Suppose output is equal to zero. Why does the firm still incur costs in the short run when output is equal to zero? What is the fixed cost of this firm? What is the price of a unit of capital? What is the wage rate? c) At what level of labor usage does the law of diminishing returns first occur? 6) Johnny Joe's is a burrito store that wants to raise their total revenue. The staff can identify customers as freshmen or upperclassmen, but other than that they all look the same. Currently all burritos are $6 each. Johnny Joe's is thinking of changing the price to $3 per burrito. Having studied the market for burritos, Johnny Joe knows how consumers are likely to respond to the price change and has provided you this information in the table below: Price Quantity demanded by Freshmen Quantity demanded by Upperclassmen $6 300 300 $3 900 360 a) What is the price elasticity of demand for each of these groups, using the midpoint method? b) What is Johnny Joe's total revenue at the current price of $6/burrito? What is Johnny Joe’s total revenue at a price of $3/burrito? c) What is Johnny Joe's total revenue if they charge upperclassmen $3/burrito and they charge freshmen $6/burrito? What is Johnny Joe’s total revenue if they charge upperclassmen $6/burrito and they charge freshmen $3/burrito? d) d) Which of the pricing schemes considered yielded the highest total revenue? Explain why this is best pricing scheme for Johnny Joe's to use in order to maximize total revenue7)
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