本文主要对剩余价值理论、资本积累理论、社会资本再生产理论、利润和平均利润理论的若干观点进行讨论。

This paper, therefore, mainly discusses the theory of surplus value, the theory of accumulation of capital, the theory of social reproduction and the theory of profit and average profit.

发改委（NDRC）的的新定价机制目的在于，消除国际原油的不稳定性，确保中国各炼油厂的平均利润为正值。

The new price mechanism by NDRC was aimed to take out of the uncertainty of the international crude to ensure the refineries in China a positive profit margin on average.