Finally, there is Joel Greenblatt’s “magic formula”. This is the most interesting formulaic approach to investing, both because it does not subject stocks to any true/false tests and because it is a composite of the two most important readily quantifiable measures a stock has: earnings yield and return on capital. As you will recall, earnings yield is simply the inverse of the P/E ratio; so, a stock with a high earnings yield is simply a low P/E stock. Return on capital may be thought of as the number of pennies earned for each dollar invested in the business. The exact formula that Greenblatt uses is described in “The Little Book That Beats the Market”. However, the formula used is rather unimportant. Over large groups of stocks (which is what Greenblatt suggests the magic formula be used on) any differences between the various return on capital formulae will not have much affect on the performance of the portfolios constructed. Greenblatt claims his magic formula may be used in two different ways: as an automated portfolio generation tool or as a screen. For an investor like you (that is, one with sufficient curiosity and commitment to frequent a site such as this) the latter use is the more appropriate one. The magic formula will serve you well as a screen. I would argue, however, that you needn’t limit yourself to stocks screened by the magic formula, if you have full confidence in your judgment regarding some other stock.
These four formulaic approaches (the three from Dreman and the one from Greenblatt) will likely yield returns greater than or equal to the returns you would obtain from an index fund. Therefore, you would do better to invest in your own basket of qualifying stocks than in the prefabricated market basket. If you want to be a passive investor, or believe yourself incapable of being an active investor, these formulaic approaches are your best bet. In fact, if I were approached by an institution making long – term investments and using only a very small percentage of the fund for operating expenses, I would recommend an automated process derived from these four approaches. I would also recommend that 100% of the fund’s investable assets be put into equities, but that is a discussion for another day (in fact, it’s a discussion for Tuesday; my next podcast is devoted to the dangers of diversification). If, however, you believe you have what it takes to be an active investor, and that is truly what you wish to be, then, I would suggest you do not use these approaches for anything more than helping you generate some useful ideas.
If you choose this path, you need to be clear about what being an active investor entails. Read this next part very carefully (it is correct even though it may not appear to be): I have never found a screen that generates more than one buy order per hundred stocks returned. Even after I have narrowed the list of possible stocks down by a cursory review of the industry and the business itself, I have never found a method that can consistently generate more than one buy order per twenty – five annual reports read. Here, I am citing my best past experiences. In my experience, most screens result in less than one buy order per three hundred stocks returned, and I usually read more like fifty to a hundred annual reports per buy order at a minimum. You may choose to invest in far more stocks than I do. Perhaps instead of limiting yourself to your five to twelve best ideas as I do, you might want to put money into your best twenty – five to thirty ideas. Do the math, and you’ll see that is still quite a bit of homework. That’s why remaining a passive investor is the best bet for most people. The time and effort demanded of the active investor is simply too taxing. They have more important, more enjoyable things to do. If that’s true for you, the four formulaic approaches outlined above should guide you to above market returns.