不过我发现对第二定理的理解有争议呢，呵呵。欢迎大家继续指导

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     pareto optimum is analogous to local extremum, while maximization of social welfare function is analogous to the global maximum of a function. maximization of social welfare function must be pareto optimal, however, a pareto optimum is not necessary maximization of social welfare function.
     hence, pareto optima are much weaker than maximization of social welfare.
     under strict even exact supposition, the first theorem of welfare economics says that:
     the competitive market can reach the pareto optimum.
     the second theorem says that:
     through free exchanges and competitively relative prices, from any endowments the pareto optimum can be reached.
     the key to understand and criticize the two theorems is to notice that the strict and exact premises to deduce the theorems.
   
   
  

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