Economics: Principles & Policy
14th Edition
ISBN: 9781337696326
Author: William J. Baumol; Alan S. Blinder; John L. Solow
Publisher: Cengage Learning
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Chapter 4, Problem 9DQ
To determine
Identify the suitable explanation for the given situation.
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Problem 2
Difference-in-Difference
In the beginning of 2005, Minnesota increased the sales tax on alcohol. Suppose you are
interested in studying the effect of the increase in sale taxes on alcohol on the number of car
accidents due to drinking in Minnesota. Unlike Minnesota, Wisconsin did not change the
sales tax on alcohol. You decide to use a Difference-in-difference (DID) Model. The numbers
of car accidents in each state at the end of 2004 and 2005 are as follows:
Year
Number of car
accidents in Minnesota
Number of car
accidents in Wisconsin
2004
2000
2500
2005
2500
3500
a. Which state is the treatment state and which state is the control state? (10 points)
b. What is the change in the outcome for the treatment group between 2004 and 2005?
(5 points)
C. Can we interpret the change in the outcome for the treatment group between 2004
and 2005 as the causal effect of the policy on car accidents? Explain your answer. (10
points)
d. What is the change in the outcome for the control…
Environmental Economics
Environmental Economics
Chapter 4 Solutions
Economics: Principles & Policy
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