marginal price
5.This article is based on the present domestic electric power market two quite mature algorithms (accountant cost law and marginal cost law), it has discussed to compensate the question which has not involved unbalanced the power supplies and distribution price in algorithms, and carries on the quantification analysis.
6.Finally, After the essential factors that effect the ticket price of Chongqing light rail transit are analyzed theoretically, This paper conclude that the optimal price level, which is between the marginal cost and the average cost, can be determined by Ramsey pricing model and the idea of“Peak-load Pricing”.

