问题如下：
With respect to capital market theory, which of the following statements best describes the effect of the homogeneity assumption? Because all investors have the same economic expectations of future cash flows for all assets, investors will invest in:
选项：
A. the same optimal risky portfolio.
B. the Standard and Poor’s 500 Index.
C. assets with the same amount of risk.
解释：
A is correct.
The homogeneity assumption refers to all investors having the same economic expectation of future cash flows. If all investors have the same expectations, then all investors should invest in the same optimal risky portfolio, therefore implying the existence of only one optimal portfolio (i.e., the market portfolio).
老师，这个assumption的原理能再解释一下吗？上课时这个点没怎么听懂。
