What is the key assumption in the difference-in-differences method? Two groups of people should have the same potential outcomes Two groups of people should have the same time trend in their potential outcomes Two groups of people should have the same potential outcomes before the policy is in place Two groups of people should have the same potential outcomes after the policy is in place

ENGR.ECONOMIC ANALYSIS
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Author:NEWNAN
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What is the key assumption in the difference-in-differences method?
Two groups of people should have the same potential outcomes
Two groups of people should have the same time trend in their potential
outcomes
Two groups of people should have the same potential outcomes before the
policy is in place
Two groups of people should have the same potential outcomes after the policy
is in place
Transcribed Image Text:What is the key assumption in the difference-in-differences method? Two groups of people should have the same potential outcomes Two groups of people should have the same time trend in their potential outcomes Two groups of people should have the same potential outcomes before the policy is in place Two groups of people should have the same potential outcomes after the policy is in place
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