Here are four dangerous assumptions that could hurt your retirement ... in the 2000s, for example, the S&P 500 actually lost money on an annualized basis. That was because stocks were pricey ...

The research ... As an example, companies thinking of expanding into new markets by producing both smartphones and tablets ...

This example illustrates the PERT statistical ... It is not surprising that this topic is the subject of much research. In view of the inaccuracies that can stem from the original PERT assumptions, ...

But there have been stretches in market history when returns have been lower; in the 2000s, for example ... negative once inflation is factored in. Assumption #3: You will work past age 65 ...