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6.Yo would like to estimate the effect of police size on city-level crime on a cross-section of cities. A regression of crime rate on police
size (per population) gives an estimate of 0. Suppose that people make their city increase police size if crime increases for some other
reason.
(a) Does that lead to a bias the OLS estimates for the causal effect of police size
on crime? Explain.
(b) Does the estimated 0 coefficient mean that police size has no effect on
crime?
(c) What assumptions should a valid IV satisfy in this case?
(d) Do you think electoral cycles can serve as a valid instrument (assuming incumbent city governments spend more on police in election years, ceteris paribus)? Why or why not?
suppose you take out a car loan of $10,000 with an interest rate of 12% compounded monthly. you will pay off the loan over 48 months with equal monthly payments. a) what is the monthly interest rate b) what is the amount of the equal monthly paymen..
Tom earns $15 per hour for up to 40 hours of workeach week. He is paid $30 per hour for every hour in excess of 40.Tom faces a 20% tax rate and pays $4 per hour in child careexpenses for each hour he works.
Kal Tech Engineering is investigating the possibility of acquiring new automated packaging equipment at a cost of $12,000. The equipment will have a salvage value of $1,000 at the end of its useful life of 10 years. It is determined by the plant e..
A real estate agent bought some farming lands for $100,000 five years ago. He sold the property this year for $500,000. If the annual inflation rate for the past 5 years has been at 6%, what is the after-tax real interest rate for this investment.
Bounds Inc.has determined through regression analysis that its sales (S) are a function ofthe amount ofadvertising (measured in units) in two different media
In developing a subdivision, the developer is required to build the roads to the city building code specifications and to deposit an amount which will allow the city to repave the roads every four years for an indefinite period of time. The costs ..
(a.) Is demand elastic or inelastic in the $6-$8 price range How do you know (b.) If the table represents the demand faced by a monopoly firm, then what is that firm's marginal revenue as it increases output from 1700 units to 2300 units
Consider a consumer that chooses a bundle of leisure time (r) and a composite good (c) to maximize the utility function U(c, r) = c + 16(r1/2), where c is the number of units of the composite good consumed, and r is the number of hours of leisure ..
a). Determine the breakeven output and total sales revenues and draw the cost-volume-profit chart, and b). determine the output that would generate a total profit of $60,000 and the total sales revenues at the output level; draw the cost-volume-pr..
A family wants to start an education account in 2010 (1st payment at year end 2010) by making equal annual payments in constant 2010 dollars until the time of the last tuition payment. Calculate the equal annual constant 2010 dollar payment.
Beerco manufactures ale and beer from corn, hops, and malt. Currently, 40 lb of corn, 30 lb of hops, and 40 lb of malt are available. A barrel of ale sells for $40 and requires 1 lb of corn, 1 lb of hops, and 2 lb of malt. A barrel of beer sells f..
to construct a p-chart for a manufacturing process 25 samples of size 200 were drawn from the process. the number of
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