Incremental Risk Aversion and Diversification Preference
证明，相对于初始风险（现状）的均值独立增量风险与独立于现状的风险生成的增量风险向量空间一致，并探讨了风险厌恶与多样化偏好的关系。
The class of mean-independent incremental risks defined with respect to an initial risk, or status quo, is shown to coincide with the vector space of incremental risks generated from risks that are individually independent of the status quo. Using this characterization of mean independence, aversion toward independent risk increases, together with diversification preference for mean-independent risk increases, implies aversion toward mean-independent risk increases. By contrast, a nondiversifier who is averse to independent risk increases may nonetheless strictly prefer certain mean-preserving increases in risk.Journal of Economic LiteratureClassification Numbers: D80, D81.