Define total cost, average total cost, and marginal cost. How are they related?

定义总成本，平均总成本，边际成本。它们之间关系是什么？

youdao

Your argument is that almost all administrative cost is fixed and thus on what you define as total cost the private sector administrative cost on a per member basis is lower.

FORBES: The Myth of Medicare's 'Low Administrative Costs'

Barrick said it has been working with other members of the World Gold Council to define an all-in sustaining cash cost measure that better represents the total cost of producing gold.

FORBES: FOCUS: Some Fund Managers Like New 'All-In' Gold Miner Cost Metrics; Others Say More Is Needed