Given only the following excerpt of an E-R model: 
Which of the following is known to be true?
Definitions:
ATC
Average Total Cost, which is the total cost of production divided by the quantity of output produced, encompassing both fixed and variable costs.
Plant Size
The physical capacity or output potential of a manufacturing or production facility.
Implicit Cost
The opportunity cost of using resources already owned by the firm for its current purpose, rather than their next best alternative use.
Economic Profits
The surplus remaining after total costs (both explicit and implicit) are subtracted from total revenues, often indicating the financial health and efficiency of a company.
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