投资是企业生产经营和发展壮大的必要手段,是企业运用资金的主要领域之一,也是企业调整产品结构、实现产业更新换代、增强企业竞争力的主要途径。当投资者做出投资决策时,不仅要考虑预期回报,还必须分析比较投资风险。通过恰当的投资组合,利用投资资产的多样化,能够分散非系统风险。投资组合的结构包括资产配置和投资组合的最优化,以此来实现既定投资目标下的最佳回报。 Investment is an essential means of production, operation, development and growth of enterprises. It is also one of the major areas for enterprises to use funds. It is also the main way for enterprises to adjust their product mix, upgrade their industries and enhance their competitiveness. When investors make investment decisions, not only to consider the expected return, but also must analyze and compare the investment risk. Through the appropriate investment portfolio, the diversification of investment assets can diversify non-systemic risks. The structure of the portfolio includes the optimization of asset allocation and portfolio, in order to achieve the best return under the given investment objectives.