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Part $1$

When does a$$ long$-$run equilibrium occur in a perfectly competitive$$ industry?

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Part $1$

In a perfectly competitive$$ industry, a$$ long$-$run equilibrium occurs$\_\_\_\_\_\_\_.$

A$.$

whenever firms have no incentive to shut down

B$.$

when each firm is making zero economic profit and no firm has an incentive to enter the industry

C$.$

when firms are maximizing economic profit and some of them advertise their goods

D$.$

when firms are maximizing profit and only when economic loss does not exceed total fixed cost.