NBER Publications by William Jack

Flexible Spending Accounts (FSAs) subsidize out-of-pocket health expenses not covered by employer-provided health insurance, making health care cheaper ex post, but also reducing the incentive to insure. We use a cross section of .rm-level data to show that FSAs are indeed associated with reduced insurance coverage, and to evaluate the welfare consequences of this shift. Correcting for selection effects we find that FSAs are associated with insurance contracts that have coinsurance rates about 7 percentage points higher, relative to a sample average coinsurance rate of 17 percent. Meanwhile, coinsurance rates net of the subsidy are approximately unchanged, providing evidence that FSAs are welfare-neutral. These results show that FSAs may explain a significant fraction of the shift in h...