從政府規(guī)制定價的角度，在信息不對稱情況下分析了政府對自然壟斷行業(yè)的規(guī)制定價與效率損失，比較了政府規(guī)制和未進行規(guī)制時的價格、消費者剩余和社會福利變化。從而得出：盡管信息的不對稱性使政府對自然壟斷行業(yè)的規(guī)制產生效率損失，但政府對自然壟斷行業(yè)進行規(guī)制時的經濟效率仍比行業(yè)壟斷時要高。
關 鍵 詞 自然壟斷; 規(guī)制定價; 社會福利; 經濟效率

Abstract Based on the asymmetric information, this paper analyzed the price-regulation and efficiency lose of natural monopoly industry, and also compared the changing of consumer surplus and social welfare between regulation and unregulation. It drew the conclusion that even though the asymmetry caused efficiency loss of government’s rules on the natural monopoly industry, the economy efficiency with government’s regulation on monopoly industry is higher than that with monopoly industry.
Key words natural monopoly; regulation price; social welfare; economy efficiency