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Persistence of Economic profits in long run

I have a problem in economics on Persistence of Economic profits in long run. Please help me in the following question. Economic profits will continue in long run only when: (i) There are barriers to the entry and exit. (ii) Markets are much competitive. (iii) There are no barriers to the entry. (iv) Opportunity costs are 0 (zero).

What is the most precise answer?

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