Testing effects are most pronounced in

From time to time during the nineteenth century, federal officials might be blamed for, and thrown out of office because of

A. crime rates. B. the economy. C. the environment. D. civil rights. E. All of these are correct.

The fact that the concrete, steel, and labor used to build a superhighway cannot be used to build a dam is an example of ______.

A. consumer cost B. social welfare cost C. opportunity cost D. valuation