compare and comtrast the long-run equilibrium positions which prevail in a pure monopoly and perfectly competitive industry 帮我解释一下这个题目的意思，我现在一点思路都没有！应该从哪几方面写。怎么写？解释的越仔细越好！写得好有加分！ 最好留下QQ等联系方式！
比较和对比，长期平衡形势行业与纯粹垄断和高竞争的行业 你可以从: MONOPOLY Price and output under a pure monopoly The effect of a rise in costs on monopoly price and profits Barriers to entry – protecting monopoly power in the long run
LONG RUN EQUILIBRIUM Firm and Industry Market Supply Curve Exit or Shutdown point