Principles of Microeconomics / Unit 6 MIC 0521 short lesson, about 20 seconds
Marginal Crosses Average at the Minimum
Captions available
The idea
Marginal cost crosses average total cost at its lowest point, and average variable cost at its lowest point. Below the average, marginal cost pulls it down; above, it pushes it up.
In practice
A quiz score below your average lowers the average; above it raises it.
Where people slip
The crossing is a consequence of arithmetic, not a coincidence of the drawing. Every correct diagram shows it.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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