Principles of Macroeconomics 2e
2nd Edition
ISBN: 9781947172388
Author: Steven A. Greenlaw; David Shapiro
Publisher: OpenStax
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Textbook Question
Chapter 3, Problem 30RQ
How does a
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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)
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)
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)
Chapter 3 Solutions
Principles of Macroeconomics 2e
Ch. 3 - Review Figure 3.4. Suppose the price of gasoline...Ch. 3 - Why do economists use the ceteris paribus...Ch. 3 - In an analysis of the market for paint, an...Ch. 3 - Many changes are affecting the market for oil....Ch. 3 - Lets think about the market for air travel. From...Ch. 3 - A tariff is a tax on imported goods. Suppose the...Ch. 3 - What is the effect of a price ceiling on the...Ch. 3 - Does a price ceiling change the equilibrium price?Ch. 3 - What would be the impact of imposing a price flour...Ch. 3 - Does a price ceiling increase the decrease the...
Ch. 3 - If a price floor benefits producers, why does a...Ch. 3 - What determines the level of prices in a market?Ch. 3 - What does a downward-sloping demand curve mean...Ch. 3 - Will demand curves have the same exact shape in...Ch. 3 - Will supply curves have the same shape in all...Ch. 3 - What is the relationship between quantity Demanded...Ch. 3 - How can you locate the equilibrium point on a...Ch. 3 - If the price is above line equilibrium level,...Ch. 3 - When the price is above the equilibrium, explain...Ch. 3 - What is the difference between the demand and the...Ch. 3 - What is the difference between the supply and the...Ch. 3 - When analyzing a market, how do economists deal...Ch. 3 - Name some factors that can cause a shift in line...Ch. 3 - Name some farm that can cause a shift in the...Ch. 3 - How does one analyze a market where both demand...Ch. 3 - What causes a movement along the demand curve?...Ch. 3 - Does a price ceiling attempt to make a price...Ch. 3 - How does a price ceiling set below the equilibrium...Ch. 3 - Does a price floor attempt to make a price higher...Ch. 3 - How does a price floor 521 above the equilibrium...Ch. 3 - What is consumer surplus? How is it illustrated on...Ch. 3 - What is producer surplus? How is it illustrated on...Ch. 3 - What is total surplus? How is it illustrated on a...Ch. 3 - What is the relationship between total surplus and...Ch. 3 - What is deadweight loss?Ch. 3 - Review Figure 3.4. Suppose the government decided...Ch. 3 - Explain why the following statement is false: In...Ch. 3 - Explain why the following statement is false: In...Ch. 3 - Consider the demand for hamburgers. If the price...Ch. 3 - How do you suppose the demographics of an aging...Ch. 3 - We know that a change in the price of a product...Ch. 3 - Suppose there is a soda tax to curb obesity. What...Ch. 3 - Use the four-step process to analyze the impact of...Ch. 3 - Use the four-step process to analyze the impact of...Ch. 3 - Suppose both of these events took place at the...Ch. 3 - Must government policy decisions have winners and...Ch. 3 - Agricultural price supports result in governments...Ch. 3 - Can you propose a policy that meld induce the...Ch. 3 - What term would an economist use to describe what...Ch. 3 - Explain why voluntary Martians improve social...Ch. 3 - Why would a free market mar operate at a quantity...Ch. 3 - Review Figure 3.4 again. Suppose the price of...Ch. 3 - Table 3.8 shows information on the demand and...Ch. 3 - The computer market in recent years has seen many...Ch. 3 - Table 3.9 illustrates the markets demand and...Ch. 3 - Table 3.10 shows the supply and demand for movie...Ch. 3 - A low-income county decides to set a price ceiling...
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