The challenge for capitalism is that the things that breed trust also breed the environment for fraud.

Instead of mindlessly tossing billions at or taking billions from the Net as such, investors should be spending their time making sure that it's the future Fords and General Motors of cyberspace that are getting the capital they need.

By the time of the '90s boom, CEOs had become superheroes, accorded celebrity treatment and followed with a kind of slavish scrutiny that Alfred P. Sloan could never have imagined.

To be sure, if you watch CNBC all day long you'll pick up some interesting news about particular companies and the economy as a whole. Unfortunately, to get to the useful information, you have to wade through reams of useless stuff, with little guidance on how to distinguish between the two.

The Internet has become a remarkable fount of economic and social innovation largely because it's been an archetypal level playing field, on which even sites with little or no money behind them - blogs, say, or Wikipedia - can become influential.

You might think of consumption as a fairly passive activity, but buying new products and services is actually pretty risky, at least if you value your time and money.

Markets work best when there's lots of information available and a historical track record to go on; they excel at predicting things like horse races, election outcomes, and box-office results. But they're bad at predicting things like who will be the next Supreme Court nominee, as that depends on the whim of the president.