By mixing investment in individual securities, you can obtain an even wider selection of risk and return: in fact, anywhere in the shaded area in Figure 8.5.

• 通过混合各支股票的投资，你可以得到一个更加宽泛的风险和回报的选择：事实上，图形8.；5的阴影区域的任何地方（都是）。