社会环境的复杂多变与契约人有限理性的双重约束所导致的交易费用的必然永存性意味着交易费用势必会成为有限理性的契约人①追求个人收益最大化途径上的天然摩擦力。但在人类理性的作用下,人们会尽其所能地寻求降低交易费用的途径。而且在漫长的社会历程中,有限理性的契约人寻求降低交易费用途径的巨大精神动力作为一种强劲的社会推动力充分地体现了其在社会体系的形成与社会经济增长、社会进步及社会秩序有效性与公平性方面的社会功用。本文就此试做分析。 The inevitability of the transaction cost caused by the complex and changeable social environment and the limited restriction of the contractual person means that the transaction cost will inevitably become the limited rational contractual person ① Pursuing the natural friction in the way of maximizing personal income. However, under the influence of human reason, people will try their best to find ways to reduce transaction costs. And in the long social history, bounded rationality contractors seek great spiritual power to reduce transaction costs as a powerful social driving force fully reflects its social system formation and social economic growth, social progress and social order Social Function in Effectiveness and Fairness. This article try to do this analysis.