The diagram indicates that the marginal revenue of the sixth unit of output is:

In the above figure, using the slope across an arc, the slope of the curve between points a and b is

A) 1/2. B) -1/2. C) 2. D) -2.

The expression "increase in quantity supplied" is illustrated graphically as a

A) leftward shift in the supply curve. B) rightward shift in the supply curve. C) movement up along the supply curve. D) movement down along the supply curve.