What is a characteristic effect of barriers to entry in a market?

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Allow firms to earn excessive profits indefinitelyCause firms to incur losses over an extended periodPermit firms to gain abnormal profits only temporarilyAre typically found in perfectly competitive marketsPrevent any new firms from entering the market at all times

Explanation

Barriers to entry usually result in firms facing losses in the long run, as they limit competition but do not guarantee sustained abnormal profits. They are not common in perfect competition, where entry and exit are free.