(35p) In this problem, we'll replicate the main analysis in "Advertising and Environmental Stewardship: Evidence from the BP Oil Spill" by Lint Barrage, Eric Chyn, and Justine Hastings, American Economic Journal: Economic Policy 2020 12(1) 3361. They study the impacts of the April 2010 Deepwater Horizon (an oil rig owned by BP in the Gulf of Mexico) oil spill on the prices that BP is able to charge at the pump. Then they study how advertising is able to mute these responses. But we'll just replicate the first results on the impact on prices overall. To do this, the authors build a dataset of average net prices at BP gas stations and at nearby nonBP competitor gas stations. The net price is the gap between the price at the pump and the wholesale gas price that the gas stations pay. It's a measure of how much of a markup the retail gas stations are able to charge over and above the wholesale price. They then develop a difference in differences strategy comparing the way that prices changed at BP gas stations around the time of the oil spill to the way that prices changed at the non-BP competitors in the