自然壟斷natural monopoly)係經濟學上嘅現象。指因為加入一個產業需要龐大嘅成本同第啲阻止外界加入生產嘅因素,搞到個市場得一個賣家,而個賣家唔使同第啲賣家競爭之餘,仲可以單方面操控價格(相比之下,如果個市場有多個賣家,噉一個賣家加價之前起碼要考慮自己會唔會因為競爭對手唔加價而冇咗啲客),造成市場達唔到最高嘅效率


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