Here are some production possibilities for an imaginary economy for a given year. 
If the production possibilities frontier is bowed outward,then in place of "?" we might have
Definitions:
Variable Costs
Financial obligations that move in correlation with production levels.
Long-Run Equilibrium
A state in an economy or market where, given the long-term flexibility of prices and adjustment of all input factors, supply equals demand and all firms earn normal profits.
Demand Curve
A graphical representation showing the relationship between the price of a good and the quantity demanded by consumers, typically downward sloping.
Average Total Cost
The total cost of production divided by the total output, representing the cost per unit of output.
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