The most important part of this whole presentation is that credit drives everything. If you know how credit is coming into the economy you can anticipate credit cycles. Credit cycles are the only thing you have to keep your eye on in order to keep from getting destroyed in economic crashes.
The credit cycle stuff is well explained by Austrian Business Cycle Theory[1], but that's a brain bender and once you get it will make you totally unable to have an economics conversation with anybody who doesn't understand it either.
[1].http://wiki.mises.org/wiki/Austrian_Business_Cycle_Theory