A very simple bad decision is to get into debt. And that is very expensive.

In terms of the actual curriculum for management education, my own view is very simple-minded: The world is incredibly complex, it changes all the time, and we should not even hope that we could create a general model that accurately describes the world in all its possible states.

Not all debt is bad. From time to time we should get into debt when there's a good reason for that.

Thinking is difficult and sometimes unpleasant.

You can think about life as a battle between you and a doughnut shop. The doughnut shop wants you to eat another doughnut and pay the money, and you want to do it in the short term, but in the long term it's not good for you either financially or from a health perspective.

The problem with opportunity cost is that opportunity cost is divided among many, many things.

I always found the appeal to the market gods a bit odd. Why would the market fix mistakes instead of aggravating them?