本研究旨在重新探討空間市場的社會最適定價。與Hsu(1983)不同，本 文將同時檢視最適定價及最適的市場範圍。本文將採用非常一般的模型；換 言之，本文不會像Holahan(1978)及Norman(1981)，假設線型的需求函數、 固定的邊際成本、齊一的消費者分配.等。本文的研究結果應有助各國主管 當局執行公平法時參考 Only few attempts are made to analyze welfare-maximizing pricing under alternative spatial pricing policies, while the economic benefit implications of alternative profit-maximizing prices have been received much attention in the literature. Recognizing that such knowledge is essential for a complete understanding of welfare implications of spatial monopolistic pricing, this research attempts to revisit the spatial equivalent of marginal cost pricing. Our model is same as Hsu (1983) with only one exception that in addition to prices, the market area is a control variable to maximize social welfare. That is to say, the analysis of this research will be conducted without those restrictive assumptions made by Holahan (1978) and Norman (1981) such as linear demand, uniform consumer density, constant marginal production cost, and so on. Moreover, we will focus on the entire market rather than on a single market point as done by Holahan (1978) and Norman (1981). The findings of this research, we believe, can improve the understanding of the social desirability of alternative spatial pricing policies which maybe helpful for antitrust authorities of countries in this world to judge the moral of pricing policies in the spatial market.