select the optimal portfolio 基本例句 投资决策 In large financial institutes which take quantitive analysis into use, investors build up investment decision and risk management tools from portfolio theory of Markowitz.在使用数量化分析的大机构里，投资者所建立的投资决策工具和风险管理工具，大部分是基于马科维茨组合理论的基本原理。