世界银行：社会违约与计划选择：配偶追随案例（英文版）

This paper studies how couples in the Medicare Part D program choose an insurance plan. Over 70 percent of enrollees choose the same plan as their spouse. Even among those with differing health care needs, well over half do so. Discrete- choice models suggest that beneficiaries place a value of more than $1,000 per year on being on the same plan as their spouse. Using a regression-discontinuity design, the paper shows that younger spouses disproportionately follow their older spouse’s plan ch