The typical total profit graphical presentation is shown as

a. a hill

b. as s-shaped curve

c. a square

d. a u-shaped curve

marginal revenue is the addition to a firms revenue from

a. a one-unit change in output

a $1 reduction in marginal cost

c. a $1 change in price

d. the sale of inferior output

optimal decisions are made on the basis of

a. average cost and average revenue figures

b. marginal cost and marginal revenue figures

c. rate of growth in total profit

d. impact on the market share.