The more confidence I have in each one of my stock picks, the fewer companies I need to own in my portfolio to feel comfortable.

There’s a virtuous cycle when people have to defend challenges to their ideas. Any gaps in thinking or analysis become clear pretty quickly when smart people ask good, logical questions. You can’t be a good value investor without being an independent thinker – you’re seeing valuations that the market is not appreciating. But it’s critical that you understand why the market isn’t seeing the value you do. The back and forth that goes on in the investment process helps you get at that.

The big picture is: the main thing you should be concerned about in the future are incremental returns on capital going forward. As it turns out, past history of a good return on capital is a good proxy for this but obviously not foolproof. I think this is an area where thoughtful analysis can add value to any simple ranking/screening strategy such as the magic formula. When doing in depth analysis of companies, I care very much about long term earnings power, not necessarily so much about the volatility of that earnings power but about my certainty of "normal" earnings power over time.

I think the exercise of trying to figure out how to simplify concepts has been incredibly helpful to me over the last 13 years of teaching and I hope my students have benefited from it.

We are busy surviving, herding, fixating on what just happened, and being overconfident!

I still believe that for good business analysts a concentrated portfolio is a good strategy combined with a long term horizon. Once again, the secret to success in following the formula strategy is patience, a quality in short supply for both professionals and individual investors alike. I think investors should have a large portion of their assets in equities over time.

If I plug my estimates into the Magic Formula, and it comes out cheap, that's good.