Why does the short-run aggregate supply curve slope upward?
A. Profits rise when the prices of the goods and services firms sell rise more rapidly than the prices they pay for inputs
B. An increase in market prices results in an increase in quantities supplied, as stated by the law of supply.
C. As the number of workers, machinery, and equipment increase, and technological changes occurs, quantity supplied increases
D. All of the above cause the short-run aggregate supply curve to slope upward
Why does the failure of workers and firms to accurately predict the price level result in an upward-sloping aggregate supply curve?
A. because contracts between workers and firms make some wages and prices "sticky"
B. because menu costs make some prices "sticky"
C. because firms are often slow to adjust wages
D. All of the above.