The figure below shows the long-run average cost curve for a firm. Based on the figure, the region z shows _____.Figure 6-5 
Definitions:
Break-Even Revenue
The amount of income needed to cover all operating expenses, with no profit or loss.
Fixed Costs
Expenses that do not change with the level of production or sales, such as rent or salaries.
Variable Cost
Costs that change in proportion to the good or service that a business produces.
Profit
The financial gain obtained when the revenue from selling goods or services exceeds the total cost of producing them.
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