Efficiency of an Information System in an Agency Model
比较不同信息系统在代理模型中的相对效率，发现似然比分布的均值保留展宽关系足以在一般条件下对信息系统排序，且适用范围比Holmstrom的信息性标准和Blackwell定理更广。
Different information systems are compared in terms of their relative efficiencies in an agency model. The mean preserving spread relation between the likelihood ratio distributions derived from the original information systems is found to be sufficient to rank information systems under quite general assumptions about the agent's utility function. Furthermore, it is shown that the mean preserving spread criterion can be applied to a broader set of information systems than Holmstrom's informativeness criterion and Blackwell's theorem