Some economists compare schooling and earnings among identical twins to estimate the causal effect of schooling on earnings. a. Why can't we just compare the average wage of high school and college graduates to arrive at a measure of the return to schooling? How does a comparison of twins improve our estimate of the return to schooling? b. Are there reasons why using twins might give us an inaccurate measure of the return to schooling?

Essentials of Economics (MindTap Course List)
8th Edition
ISBN:9781337091992
Author:N. Gregory Mankiw
Publisher:N. Gregory Mankiw
Chapter1: Ten Principles Of Economics
Section: Chapter Questions
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3. Some economists compare schooling and earnings among identical twins to estimate the
causal effect of schooling on earnings.
a. Why can't we just compare the average wage of high school and college graduates
to arrive at a measure of the return to schooling? How does a comparison of twins
improve our estimate of the return to schooling?
b. Are there reasons why using twins might give us an inaccurate measure of the
return to schooling?
Transcribed Image Text:3. Some economists compare schooling and earnings among identical twins to estimate the causal effect of schooling on earnings. a. Why can't we just compare the average wage of high school and college graduates to arrive at a measure of the return to schooling? How does a comparison of twins improve our estimate of the return to schooling? b. Are there reasons why using twins might give us an inaccurate measure of the return to schooling?
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