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Effective price discrimination to maximize profit

Effective price discrimination to maximize profit does NOT needs the firm to be capable to: (w) separate the market within different groups along with different demand elasticities. (x) erect entry barriers to defend a monopoly position. (y) prevent trading (i.e., arbitrage) between customers which pay different prices. (z) exercise several monopoly power.

Please choose the right answer from above...I want your suggestion for the same.

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