Global warming of the past century, and especially in the past decade, is at least partly a consequence of human activities that have increased ____ in the atmosphere.

What is a stock? How do stocks affect the economy?

What will be an ideal response?

Refer to the graphs below. They show the long-run average total cost (LRATC) for cars. Just after World War II the Ford Motor Company opened a large automobile manufacturing facility near Detroit with capacity Q0 autos per year. Shortly thereafter, the plant was closed and two smaller ones were opened in the same vicinity, each more profitably producing about one-half as many cars as the old facility. Which graph best shows the situation described above, when only one plant was operating?

A. Graph A
B. Graph B
C. Graph C
D. Graph D