From 1973 to the early 1990s, U.S. productivity _______, and since the early 1990s, U.S. productivity _______.

A grower of commercial Christmas trees can raise blue spruce and Douglas fir. Therefore, an increase in the expected market price of Douglas firs tends to

A) reduce the planting of Douglas firs. B) reduce the planting of blue spruce trees. C) increase the cost of planting Douglas firs. D) do none of the above.

Examine how the invention of the seat belt may have created a moral hazard problem

Please provide the best answer for the statement.