What is the marginal-average rule?
It us rule which applies to many situations like cost, revenue in economics
According to this rule when marginal value is below average value say E. G marginal revenue<average revenue average value I. E average revenue will fall. When marginal value is above average, average value will rise and when marginal value=average value average will not change. Note however it says how average changes with respect to margial, not how marginal changes with respect to average
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