Gen Combo Microeconomics; Connect Access Card
Gen Combo Microeconomics; Connect Access Card
21st Edition
ISBN: 9781260044874
Author: MCCONNELL CAMP
Publisher: MCG
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Chapter 19, Problem 8DQ

ADVANCED ANALYSIS Suppose that a government wants to reduce its economy’s dependence on coal and decides as a result to tax coal mining companies $1 per ton for every ton of coal that they mine. Assuming that coal mining companies treat this tax as an increase in extraction costs this year, what effect will the tax have on current extraction in the model used in Figure 17.7? Now, think one step ahead. Suppose that the tax will be in place forever, so that it will also affect extraction costs in the future. Will the tax increase or decrease user cost? Does this effect increase or decrease the change in current extraction caused by the shift of the EC curve? Given your finding, should environmental taxes be temporary? LO17.4

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Difference-in-Difference In the beginning of 2001, North Dakota legalized fireworks. Suppose you are interested in studying the effect of the legalizing of fireworks on the number of house fires in North Dakota. Unlike North Dakota, South Dakota did not legalize fireworks and continued to ban them. You decide to use a Difference-in-difference (DID) Model. The numbers of house fires in each state at the end of 2000 and 2001 are as follows: Number of house fires in Number of house fires in Year North Dakota 2000 2001 35 50 South Dakota 54 64 a. What is the change in the outcome for the treatment group between 2000 and 2001? Show your working for full credit. (10 points) b. Can we interpret the change in the outcome for the treatment group between 2000 and 2001 as the causal effect of legalizing fireworks on number of house fires? Explain your answer. (10 points)
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C. Regression Discontinuity Birth weight is used as a common sign for a newborn's health. In the United States, if a baby has a birthweight below 1500 grams, the newborn is classified as having “very low birth weight". Suppose you want to study the effect of having very low birth weight on the number of hospital visits made before the baby's first birthday. You decide to use Regression Discontinuity to answer this question. The graph below shows the RD model: Number of hospital visits made before baby's first birthday 5 1400 1450 1500 1550 1600 Birthweight (in grams) a. What is the running variable? (5 points) b. What is the cutoff? (5 points) T What is the discontinuity in the graph and how do you interpret it? (10 points)
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