You put your product on 20% off sale market A but leave it unchanged in market B.Sales in A increase from 840 units per week to 1040 while sales in B rise from 770 to 830.The Difference-in-difference estimate of the effect of the price change is:
A) 80 units
B) 100 units
C) 120 units
D) 140 units
Correct Answer:
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