The United States changed its tax treatment of married couples in 1948, from a system in which each spouse paid taxes on his or her own income to a system in which a married couple is taxed as a unit. The switch from separate to joint taxation changed incentives for labor supply and asset...

Notches – where marginal changes in behavior lead to discrete changes in a tax or subsidy – figure prominently in many policies. In this paper, we analyze notches in fuel economy policies, which aim to reduce negative externalities associated with fuel consumption. We provide evidence that...