Marginal Cost and Average Total Cost Curves    Total costs are the sum of fixed plus variable costs, so Average Total Costs (ATC) are just the sum of AVC + AFC.

   A typical ATC curve is shown to the right with a MC curve. Just like the AVC curve, ATC is falling when MC is less than ATC, and rising when MC is greater than ATC. So the MC curve crosses the ATC curve at the minimum of ATC.

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