Suppose a perfectly competitive firm is producing 500 units of output and has total revenues of $5,000. If this is a lon

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Suppose a perfectly competitive firm is producing 500 units of
output and has total revenues
of $5,000. If this is a long run equilibrium, then it must be the
case that
A) marginal cost is less than $10
B) minimum average total cost is less than $10
C) price is $10
D) all of the above