At the same time, we have to venture at least a very educated guess about what the obsolescence factor is going to be.

同时，我们不得不冒一个风险，就是至少要对这项技术的淘汰要素会是什么做最审慎的猜测。

youdao

The argument over why value stocks have higher returns than growth has raged for years is it because investors pay too much for glamor, or is it because there is some unknown risk factor hiding under the bed, such as technological obsolescence or insolvency?

FORBES: Roger Ibbotson's New Theory Of Everything