The only way to reduce pollution is to reduce output of the polluting firms

"Underground" economic activity can best be described as

a. the construction of subway transportation. b. the building of foundation structures for skyscrapers. c. the mining and oil industries. d. barter or cash activity that is not reported as income.

Ralph is a plumber. Which of the following are included in his human capital?

a. the knowledge he learned on the job, and the tools he uses b. the knowledge he learned on the job, but not the tools he uses c. the tools he uses, but not the knowledge he learned on the job d. neither the knowledge he learned on the job nor the tools he uses