The average total cost curves for plants A, B, C and D are shown in the above figure. Which plant is best to use to produce 60 units per day?

The quantity of money in an economy is $9 million, and the velocity of circulation is 3. Nominal GDP in this economy is ________

A) $6 million B) $9 million C) $3 million D) $27 million

After selling 1,000 three-ring binders Tony DiFulvio realizes that the marginal revenue from selling the last binder was less than the marginal cost. From this we can conclude that

A) Tony's business earns a short-run economic profit. B) Tony should shut down his business temporarily. C) Tony's profit fell after selling his 1,000th three-ring binder. D) Tony's profit would be greater if he sold an additional three-ring binder.