1. There was an article in Forbes interviewing Jeremy Grantham that made me think. He suggests that value investing might be heading for a period where it will underperform. I.e., value stocks are not as relatively undervalued as they normally are. If he is correct, what should I do? I could shut off the value discipline, and run my industry models in GARP [growth at a reasonable price] or even momentum mode. That cuts against my grain; perhaps what I would do is give a little more weight to the industry models as I make my selections. That would tilt me away from hard value measures. My methods are eclectic, so I have to adapt to what the market is likely to reward 2-4 years from now.
2. “Minsky moment.” Ah, cute phrase. Well, I loved Edward Chancellor’s, “Devil Take the Hindmost,” and he has an interesting article at Institutional Investor. The themes he talks about are dear to me. My only quibble is that we aren’t yet there for a collapse. There is enough cash available to mop up problems at present. Whether that will continue to be true is another question.
3. My biggest concern is the dollar, and the carry trade. If the dollar dips below 112 yen, I suspect that there will be a self-reinforcing panic as short yen positions get covered. The Economist had a piece on this recently that made a lot of sense. Eventually we will have an unwind here, but it will come with a lot of kicking and screaming in Asia.
4. For wonks only, First American Corelogic posted a report called Mortgage Payment Reset 2007: The Issue and the Impact. Very informative on the effects of the loan reset features on hybrid loans, and what might happen to the real estate markets.

In an upcoming article at RealMoney, I will be writing an article on optimal position sizing. To do that, I use the Kelly Criterion, which says that a position size should be equal to (edge/odds). There is added complexity in applying this to stocks, because in gambling, each game is uncorrelated with the last one. In investing, if you have a number of investments going at the same time, they are to some degree correlated with one another, particularly for me, because I concentrate sectors.

The Kelly criterion applied to stock investing would recommend a fixed weight portfolio. Optimally, you would rebalance daily to those fixed weights, but there are two factors that interfere: first, there are costs to trading, and second, momentum tends to persist in the short-run. To me that implies that one has fixed weights, but that you set a band around those fixed weights for rebalancing. I use a 20% band, but the more I think about it, the band should be smaller, like maybe 10%. My portfolio has gotten bigger over the past few years, and trading costs are a smaller percentage cost factor. I’ll stick with 20% for now. It has served me well, but I will re-evaluate this.

I firmly believe that my eight rules tilt the odds in my favor. How much are each of the rules worth? Well, that I will describe in the article at RealMoney, and that hopefully will explain why holding 35 or so positions is proper for me in running my strategy.

One more thing, I appreciate the work done at the CASTrader Blog on the Kelly criterion. We manage money very differently, but we both appreciate the value of the Kelly Criterion.

PS — As an aside, I get ribbed by some at RealMoney, whether contributors or readers about holding 35 positions as hyperdiversified. In general I agree with portfolio concentration, but given that I concentrate sectors and industies, that makes 35 a lot more like 20 in terms of total volatility. On the other hand, compared to most mutual fund managers, 35 names would be a tighter ship than 95% of them run.