Since stock prices are predictions about future earnings, which are unknowable, they will never be entirely accurate, which creates periodic opportunities for investors.

• 既然股票价格反应的是企业未来盈利情况的预期，而未来的事情谁都说不准，那么这样的预测就永远不可能百分之百正确，这也给投资者带来了周期性的机会。