Deschenes, Olivier Greenstone, Michael Shapiro, Joseph S.
Year of Publication:
IZA Discussion Papers 7557
Demand for air quality depends on health impacts and defensive investments that improve health, but little research assesses the empirical importance of defenses. We study an important cap-and-trade market, which dramatically reduced NOx emissions, a key ingredient in ozone formation. A rich quasi-experiment reveals that it decreased summertime ozone, pharmaceutical expenditures, and mortality rates. Reductions in pharmaceutical purchases and mortality are each valued at $900 million annually, suggesting that defensive investments are a substantial portion of willingness-to-pay. We cautiously conclude that ozone reductions are the primary channel for these effects, implying that ozone's costs are larger than previously understood.
pharmaceuticals ozone cap and trade willingness to pay for air quality mortality compensatory behavior human health