战略随机网络：为什么社交网络技术很重要
Strategic Random Networks: Why Social Networking Technology Matters
摘要：
本文发展战略基础的一个重要的统计模型的随机网络与异质期望度。基于此，我们展示了社交网络服务如何微妙地改变关系的成本和间接收益，从而导致行为和福利的巨大变化。在该模型中，重视朋友和朋友的朋友的代理人选择社交的程度，这增加了链接的概率，但成本很高。当朋友的朋友的价值超过一个依赖于成本的阈值时，从分散的、稀疏的平衡网络到连接的、密集的平衡网络会发生急剧的转变。这种转变缓解了极端的低效率。
英文摘要：
This paper develops strategic foundations for an important statistical model of random networks with heterogeneous expected degrees. Based on this, we show how social networking services that subtly alter the costs and indirect benefits of relationships can cause large changes in behavior and welfare. In the model, agents who value friends and friends of friends choose how much to socialize, which increases the probabilities of links but is costly. There is a sharp transition from fragmented, sparse equilibrium networks to connected, dense ones when the value of friends of friends crosses a cost-dependent threshold. This transition mitigates an extreme inefficiency.
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