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→How does the author test the hypothesis?
The author's take a difference in difference approach where the main specification is:
<math>Y_{ct}-Y_{c(t-1)}= \alpha_{st} + \beta_{1t}W_{c}+\beta_{2t}W_{c}^{2}+\beta_{3t}W_{c}^{3}+\beta_{4t}W_{c}^{4}+ \epsilon_{ct}</math>
=== What do the authors tests achieve?===
