未来的资产收益是不确定的。不确定的收益可以用多种可能的取值及其对应的概率来表示,这两者的加权平均,即数学期望值,就是资产的预期收益。在投资理财中,预期收益的重要性,怎么强调都不为过。它是进行投资决策的关键输入变量。不对它做出估计,什么买卖决策、投资组合一切都免 The future return on assets is uncertain. Uncertainty can be expressed in terms of many possible values ​​and their corresponding probabilities. The weighted average of the two, the mathematical expectation, is the expected return on the asset. In the investment banking, the importance of expected earnings, how to emphasize that no overestimate. It is a key input variable for making investment decisions. Do not make an estimate of it, what trading decision, the portfolio is free