According to the text, during which time period did the United States have the highest unemployment rates?

When we say that economic fluctuations are "irregular and unpredictable," we mean that

a. the relationship between output and unemployment is erratic and difficult to characterize. b. when one macroeconomic variable that measures income or spending is falling, other macroeconomic variables that measure income or spending are likely to be rising. c. recessions do not occur at regular intervals. d. All of the above are correct.

If a hurricane were to wipe out the majority of the eastern seaboard in the United States:

A. neither the short-run nor long-run aggregate supply curves would be affected. B. only the long-run aggregate supply curve would shift left. C. only the short-run aggregate supply curve would shift left. D. the long-run and short-run aggregate supply curves would both shift left.