But the glory days of publicly traded companies dominating the American business landscape may be over. The number of companies listed on the major domestic exchanges peaked in 1997 at more than 7,000, and it has been falling ever since. It’s now down to about 4,000 companies, and given its steep downward trend will surely continue to shrink.

Nor are the remaining stocks an obvious proxy for the health of the American economy. Innovative American companies like Apple and Google may be worth hundreds of billions of dollars, but most of them don’t pay dividends or employ many Americans, and their shares are essentially speculative investments for people making a bet on how we’re going to live in the future.

Put another way, as the number of initial public offerings steadily declines, the stock market is becoming little more than a place for speculators and algorithms to compete over who can trade his way to the most money.

What the market is not doing so well is its core public function: allocating capital efficiently. Apple, for instance, is hugely profitable and sits on an enormous pile of cash; it is thus very unlikely to use its highly rated stock to pay for any acquisitions. It hasn’t used the stock market to raise money since 1981, and there’s a good bet it never will again.

Meanwhile, the companies in which people most want to invest, technology stars like Facebook and Twitter, are managing to avoid the public markets entirely by raising hundreds of millions or even billions of dollars privately. You and I can’t buy into these companies; only very select institutions and well-connected individuals can. And companies prefer it that way.