On the Efficiency and Stbility of Networks Formation

在《论网络的效率和稳定性》一文中，我们考察了网络形成的动机与网络效率之间的关系。虽然人们希望网络既高效又稳定，但这两个目标往往是不相容的。通过提出合理的要求，我们提供了避免这种冲突的条件。在“最优进入和参与者的边际贡献”一文中，我们将“企业边际贡献”的概念定义为有企业最大福利与无企业最大福利之差。可以确定：(1)在竞争市场中，企业的贡献等于企业的利润；(2)在垄断竞争市场中，企业的贡献小于利润；(3)在垄断竞争市场中，企业的进入是过度的。

In the article ''On the Efficiency and Stability of Networks" we examined the relationships between the incentive for the links formation and the efficiency of the resulting networks. Although it is desirable that networks are both efficient and stable, these two objectives are often incompatible. Imposing reasonable requirements we give conditions under which this conflict is avoided.In the article "Optimal Entry and Marginal Contribution of Players" we defined the concept of the "marginal contribution of a firm" as the difference between the maximum welfare with the firm and that without it. It is established that(I) in the competitive market, the contribution of a firm equals the profit of the firm,(ii) in the monopolistic competition market, the contribution of the firm less than the profit, and that(iii) entry is excessive in such a market.