Last week, the Obama administration announced new curbs on racial profiling by federal law enforcement. Before deciding whether this is good or bad policy, we might try to develop a description/definition of racial profiling or any other kind of profiling.

A good definition of profiling in general is the use of an easily observed physical characteristic as a guess for some other, difficult-to-observe characteristic. The reason people profile is that information is costly and they seek methods to economize on information costs. One way to do that is through profiling.