Which of the following best describes the aggregate supply curve in the short run (e.g., one to two years)? The short run aggregate supply curve is:  A. flat because output is more flexible than...

Which of the following best describes the aggregate supply curve in the short run (e.g., one to two years)? The short run aggregate supply curve is:

 A. flat because output is more flexible than prices in the short run. B. vertical because wages and other input prices fully adjust to the price level. C. upward sloping because input prices do not fully adjust to the price level in the short run.