MBA schools do a pretty good job preparing you for getting a job and working in a big organization doing high-level things like calculating the NPV of a million dollar machine. But does it do a good job preparing you if it all goes wrong?

If someone offered you an envelope with $100 cash today or the same envelope with the same $100 one year from now would you take it now or wait a year and take it then?

The NPV function is great when comparing different investment projects that have different cash flows. If all investment projects you were comparing had the exact same net cash flows ...