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

But suppose we are nothing more than the sum of our first, naive, random behaviors. What then?

Scaling down individually is very hard. Imagine that if you go to a place where everybody is dressed nicely, and you are the only one who doesn't dress nicely. Everybody goes on vacations to a great place and you go to the Jersey shore. It's very hard to do these things without an organized mechanism, but it looks to me like there might be some organized mechanisms.

Money is a great way to get happiness. Right? Lots of wonderful things you can do with money. The question is, are we really optimizing on that? So, if you think about getting lattes and getting cable. Which one of those is actually giving you a greater happiness, and if you have to cut on one of those, which one would you cut? So, I think thinking in terms of concrete terms would help us a great deal.

I don't want to say that the poor are inherently cognitively diminished, but at the end of the day of making difficult, tough decisions, it's very hard to have the energy to think about things with the right mindset.

What you should do is wait until the end of each month, and then say, "OK, how much money do I have? How much do I need? Let me send the rest to retirement."

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.