The supply curve of a natural resource like oil has a positive slope because
a. the supply becomes closer to exhaustion as demand rises.
b. it becomes more costly to find and develop supplies as demand rises.
c. rents rise as output increases.
d. indirect taxes rise with output.
Economists use models in order to
a. experiment with alternative circumstances.
b. make educated guesses about real life events.
c. predict outcomes under various hypothetical conditions.
d. increase understanding of how a relationship actually works.
e. All of the above are correct.
If production involves increasing opportunity cost, then moving nearer the horizontal
axis will increase the opportunity cost of
a. the good that is shown on the horizontal axis.
b. the good that is shown on the vertical axis.
c. both of the goods shown on the axes.