Active investment management still reigns supreme

Modern portfolio theory says you can't pick some stocks that will do better than other stocks because the market is too efficient—a "random walk."

Bruce Greenwald, the Robert Heilbrunn professor of finance and asset management at Columbia, teaches the Value Investing course once taught by the venerated Benjamin Graham himself. And Joseph Nocera, in a recent New York Times column ($$$), tells us what Bruce Greenwald says:

"Efficient market theory is basically dead."

Nocera explains the belief that investment portfolios can be intelligently designed:

Most business schools emphasize modern portfolio theory, which has as its central tenet that the market is so efficient it can't be beaten with any regularity. . . . As [Warren] Buffet put it to me recently, "You couldn't advance in a finance department in this country unless you taught that the world was flat."

Although Columbia has its share of portfolio theorists, the value investing program that Mr. Greenwald runs preaches something else: that the world is round. Or, more precisely, that the market can be beaten. Not easily, mind you, and not mindlessly. A "value" stock is, at bottom, a cheap stock. And a value investor is someone who has the facility to ferret out cheap stocks that don"t deserve to be cheap, the acumen to understand why certain such companies have what Mr. Buffett calls "a sustained competitive advantage: that will be borne out over time, the patience to wait for the market to come around to his view of things, and the discipline to stick to his value parameters through thick and thin.

Teaching value investing is one thing. Picking stocks that consistently outperform the market is quite another. As noted in the post below, by most rational standards passive investing via index funds is the better bet.

But while the mind says "index," the heart says, "Indexing is less exciting than watching grass grow." Seeking above-market returns is fun, a mild form of gambling if you will. And what's wrong with a little recreational gambling?

Most investors figure the gambles are worth the (hopefully!) modest cost. Supreme Court nominee Samuel Alito, for instance. In Slate, Henry Blodget (remember him?) analyzes Alito's reported investments and finds them generally praiseworthy. But Henry notes that Alito's Vanguard funds are not limited to index funds. They include actively managed equity portfolios, such as Wellington Management and Windsor II.

Even potential Supreme Court justices like to have a little fun!