Sorting in Experiments with Application to Social Preferences
通过两个实验室实验，研究个体基于偏好和相对价格进出经济环境的分类行为如何影响社会偏好的测量，发现补贴吸引低分享者进入，削弱了政策效果。
Individuals sort into and out of economic environments based on their preferences and in response to relative prices. We demonstrate the importance of such sorting for the measurement of social preferences, using two laboratory experiments. First, allowing subjects to avoid environments in which sharing is possible significantly reduces sharing. This reveals the existence of a type of individual who shares reluctantly, preferring to avoid the opportunity to share. Second, after subsidizing the sharing environment, the aggregate amount shared increases, but less is shared, on average, by those who enter. Thus, subsidies intended to induce more sharing have weak effects since they attract those who share the least.