America's businesses are awash in unprecedented pools of cash. The liquid assets of the 374 nonfinancial firms in Standard & Poor's 500-stock index totaled $633 billion at the end of last year. That's about $1.7 billion each, or fully 7% of their average market value. And what are corporations doing with all that dough? Much of itÑtoo much, in my opinion -- is being stashed under the mattress.

Money hoarders. Companies returned only 32% of earnings last year to their corporate owners (that is, you and me and other shareholders) in the form of dividends. That payout ratio is puny compared with the 50% average that prevailed from 1950 to 1989. And managers can no longer use onerous double taxation as an excuse for not bestowing some of the cash on the people who own their businesses.

Yes, dividends are still taxed twice. Corporations generally pay a 35% federal tax on profits, and shareholders pay a tax on the dividends those corporations distribute to them. But in 2003, Congress and the President agreed to slash the top dividend tax rate for shareholders from 35% to 15%; in May, the reduction was extended through 2010.

In 1980, all but 31 of the companies in the S&P 500 paid dividends. For the next 23 years, the number of non-dividend payers steadily increased. The tide turned in 2003, but at the end of last year 115 of the 500 still paid no dividend. Of those that did, three-fourths either increased or began a dividend in 2005. Some dividend hikes have been stunning. Coca-Cola (symbol KO), for instance, went from paying 72 cents a share in 2001 to $1.24 this year, and Wal-Mart Stores (WMT) went from 28 cents to 67 cents over the same period.

The average S&P 500 stock's yield (annual dividend payout divided by stock price) was just 1.1% in 2000. Today, the yield is 1.9%. Still, that's far below the average of 4.2% since 1926, as calculated by Ibbotson Associates. As recently as 1991, the S&P yielded 3.8%; in the early 1980s, yields averaged more than 5%.

You may wonder why I am passionate on the subject of dividends. First, they make you richer. In a study earlier this year, Eaton Vance Corp. pointed out that "approximately 65% of the return on stocks has come from the compounding of reinvested dividends." Even before reinvestment, over the past 80 years dividends have represented about two-fifths of the annual return achieved by the average S&P 500 stock.

Second, dividends are the most revealing indicator of a company's success -- better than earnings per share or return on equity. The economic textbooks say that the value of any firm depends on its flow of cash, not on any particular accounting entry. Without a dependable cash flow, a business can't pay a good dividend. Reducing or eliminating a dividend is a terrible embarrassment to managers and usually a long-term blow to a stock's price, so companies tend to raise payouts in a conservative fashion. They want to be sure they won't have to backtrack. In a world of financial hocus-pocus, the dividend is one figure you can rely on.

Four out of five executives surveyed by Eaton Vance said they think that a firm's dividend growth rate can give investors confidence in a company's projected long-term growth potential. It's true. Companies that raise their dividends consistently tend to outperform the market as a whole. For that reason, a wise strategy is to invest in companies that have increased their dividends over long periods. Such firms seem to have found a stable, profitable market niche -- a "moat," or defensive perimeter, around their business that discourages competitors.

Where to find 'em. Several exchange-traded funds (ETFs), mutual funds and closed-end funds now focus on these companies. SPDR Dividend (SDY), for example, is an ETF based on an index developed by Standard & Poor's called High Yield Dividend Aristocrats.

The index first identifies companies in the S&P Composite 1500 universe (which includes large-, mid- and small-cap companies) that have raised their dividends for at least 25 consecutive years. (At the end of last year, there were only 85.) The index then picks the 50 that have the highest dividend yields. Among these companies are ConAgra Foods (CAG), currently yielding 3.3%; Bank of America (BAC), 4.2%; and Vectren (VVC), an energy utility in Ohio and Indiana, 4.7%.

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