Something in the Air: Pollution and the Demand for Health Insurance
研究发现每日空气污染水平显著影响人们购买或取消健康保险的决定，且该行为不符合理性选择理论。空气污染每增加一个标准差，当日保险销量上升7.2%；若购买后冷却期内污染下降，退保概率增加4.0%。
We find that daily air pollution levels have a significant effect on the decision to purchase or cancel health insurance in a manner inconsistent with rational choice theory. A one standard deviation increase in daily air pollution leads to a 7.2% increase in the number of insurance contracts sold that day. Conditional on purchase, a one standard deviation decrease in air pollution during the cooling-off (i.e. cost-free cancellation) period relative to the order-date level increases the return probability by 4.0%. We explore a range of potential mechanism and find the most support for projection bias and salience.