Based on modern portfolio selection theory,investors look for theportfolio of return maximum and risk minimum if the correlations ofdifferent stock returns are smaller in international markets than in thedomestic markets.

• 现代资产组合理论(Modern Portfolio Selection Theory)认为投资者所追求的是报酬最大且风险最小的投资组合,即从理论上讲,当国际股市收益率之间的相关性小于国内股市时,投资者就可以在全球范围内进行资产组合投资。