300 words each

1) What might cause the AD curve to shift to the left? What are some of the causes of recessions? What happens if we stimulate the economy too much and demand shifts past potential output?

2) Now that Gasoline prices keep going up, should someone do something about the price of Oil? Should we allow OPEC to maintain control or not? We have already been discussing this so try to place it in the context of the lecture (oligopolies, monopolies etc.).