Dioxin is the outcome of the operations of markets. Does this mean that having dioxin in the environment is efficient? - Harvey S. Rosen

During the 1980's, the top statutory marginal income tax rate in the United States fell from 70 percent to 28 percent.

It may be worthwhile to spend a few million dollars to determine the efficacy of program that would involve spending billions of dollars.

Only empirical work - analysis based on observation and experience as opposed to theory - can answer the question of how labor force behavior is affected by changes in the tax system. Even intense armchair speculation on this matter must be regarded with considerable skepticism.