Which cost is defined as the cost of producing one more unit?

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Multiple Choice

Which cost is defined as the cost of producing one more unit?

Explanation:
The main idea is marginal cost—the cost of producing one more unit. It’s defined as the change in total cost when output rises by one unit, MC = ΔTC/ΔQ (approximately the derivative dTC/dQ). Fixed costs stay the same no matter how much you produce, so they don’t represent the cost of adding a unit. Variable costs do rise with output, but marginal cost specifically captures the incremental cost of that next unit. Total costs are simply fixed plus variable costs at a given level of output, not the cost of producing an additional unit.

The main idea is marginal cost—the cost of producing one more unit. It’s defined as the change in total cost when output rises by one unit, MC = ΔTC/ΔQ (approximately the derivative dTC/dQ). Fixed costs stay the same no matter how much you produce, so they don’t represent the cost of adding a unit. Variable costs do rise with output, but marginal cost specifically captures the incremental cost of that next unit. Total costs are simply fixed plus variable costs at a given level of output, not the cost of producing an additional unit.

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