An Increase in Productivity Will Likely Cause

An increase in productivity will likely cause

A) the AS curve to shift upward,but has no effect on the AD curve.
B) the AS curve to shift downward,and the AD curve to shift leftward.
C) the AS curve to shift upward and the AD curve to shift rightward.
D) the AS curve to shift downward and the AD curve to shift rightward.
E) the AS curve to shift downward,and have an ambiguous effect on the AD curve.