Beth Garrett, President Obama’s choice to be Assistant Treasury Secretary for Tax Policy, has withdrawn her name from consideration. Beth didn’t say why, except for the usual boilerplate about her “personal family situation.” However, the Bloomberg story on her announcement quotes a friend, lobbyist Jeff Trinca, as saying she pulled out because she was unwilling to put her family through what has become a “harsh” confirmation process.

A basic tenet of public finance holds that people tend to do less of something when it is taxed. Raise income tax rates and some people will work less. Boost the gas tax and people will drive less. Hike the cigarette tax and people will smoke less. That inexorable law of demand poses two problems for the taxman. First, taxes distort behavior as people move from taxed activities to those that are taxed less or not at all. Sometimes, as in the case of cigarette taxes, we want to discourage the taxed activity. In other cases, the tax only makes the economy less efficient. Second, tax avoidance may reduce the revenue gained from a tax increase—or even negate it entirely. For example, if gasoline sales plummet when gas taxes rise, we get less revenue to build and maintain roads.