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→How does the author rule out alternative hypotheses?
=== How does the author rule out alternative hypotheses? ===
*Counties with less woodland tend to be further west, so there is concern that estimates could be measuring some push towards increased western development. Results are robust to control for distance west of StL.
*There is also a worry that counties with different woodland levels may be suited to different crops, so changes in prices/technologies contribute to differential growth. Merge data with soil data and allow for differential quadratic growth trends.
*Convergence? The author adds controls for 1870 level of outcome interacted with each decade to allow for differential growth.
*Construction of Railroad lines my be endogenous and effect barbwire development. Add controls in country railroad track mileage.
