According to the theory of comparative advantage, potential world production is greater with unrestricted free trade than it is with restricted trade true or false

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What is one counter argument to the premise that the wealth gap is a serious problem which needs to be addressed?

Which of the following statements is (are) true? i. free entry to a perfectly competitive industry results in the industry's firms earning zero economic profit in the long run, except for the most efficient producers, who may earn economic rent. ii. in a perfectly competitive market, long-run equilibrium is characterized by lmc < p < latc. iii. if a competitive industry is in long-run equilibrium, a decrease in demand causes firms to earn negative profit because the market price will fall below average total cost.