多样化与组合风险 Diversification and portfolio risk 种股票:One- security: 风险来自宏观经济 Risks come from macro econ 风险来自企业自己 Risks come from company self 两种股票:Two- security 股票组合降低风险 Portfolio will reduce risk 8-58-5 多样化与组合风险 Diversification and Portfolio risk 一种股票： One-security ： 风险来自宏观经济 Risks come from macro econ. 风险来自企业自己 Risks come from company self 两种股票：Two - security 股票组合降低风险 Portfolio will reduce risk