At least someone knows how to fill a piggy bank.

Unlike most American consumers, whose failure to save has exasperated economists for years, the typical American corporation has increased its savings so sharply that it probably has enough cash on hand to completely pay off its debts.

That should be good news in an economy unsettled by rising energy prices, tightening credit, gyrating stock prices and declining values for the dollar and the family homestead. Indeed, the Federal Reserve chairman, Ben S. Bernanke, cited strong corporate balance sheets as a bright spot in the darkening forecast he presented to Congress last week.

Some analysts also speculate that these cash-rich companies may start sharing their wealth with investors through special dividends, providing welcome stimulus for the economy.

Corporate spending on equipment and other capital expenditures has declined as savings have soared, suggesting that companies could stimulate the economy now by going on a hiring and spending spree. But that raises worries among some analysts that companies will spend their cash unwisely, making them more vulnerable in the future.