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→How does the author test the hypothesis?
<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>
*the estimated <math>\beta</math> are allowed to vary in each decade and summarize how changes over each decade in county outcome Y vary by country woodland level W
* We are looking at low woodland areas vs high woodland areas. The sample is county & decade. We need the introduction of barbwire to be endogenous i.e. it can't be correlated with better crops in any way.
=== What do the authors tests achieve?===
