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Costume jewelry is produced in a monopolistically competitive market. A profit-maximizing producer finds that marginal revenue = marginal cost = $4.50 when output is 700 rings. An economist studying this information can conclude that:a.the producer is charging a price of $4.50.b.economic profit is $3,150.c.the producer charges a price greater than $4.50.d.new firms will want to enter.e.this producer should produce more than 700 rings