Following Keynesian economics, and assuming a marginal propensity to consume (MPC) of 0.75, an increase in federal government spending of $100 billion at below full employment would be expected to shift the aggregate demand curve by $300 billion to the right

Which of the following would shift the short-run Phillips curve?

a. an negative supply shock b. an increase in inflationary expectations c. a decrease in inflationary expectations d. All of the above.

The market clearing price of corn has just increased. Which of the following could have caused this change?

A) a reduction in demand B) a reduction in supply C) an increase in quantity demanded D) an increase in quantity supplied