Using the absolute deviation as a risk measurement index, a novel absolute deviation optimal purchasing portfolio model for multiple markets is built in risk minimization target.

用绝对离差度量供电公司的购电风险，建立以风险最小化为目标的多市场购电组合优化模型。

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Based on balance management, this paper proposed an optimal issuance model of national debt in order to minimize the expected interest cost of portfolio of national debt.

基于国债余额管理提出了一个国债最优发行模型，以最小化所发行国债组合的期望利率成本。

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The results show that optimal portfolio determined by this model is M-V efficient portfolio.

结果表明，该模型所确定的最佳证券组合为M - V有效证券组合。

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