The American economy is sputtering and we are running out of options. Interest rates can't go any lower. Another burst of government spending -- whether a good or bad idea -- looks politically impossible. Can anything protect us from the dangers of stagnation or a double dip? Actually, there is a second stimulus that could have a dramatic effect on the economy -- even more so than government spending. And it won't add to the deficit.

The Federal Reserve recently reported that America's 500 largest nonfinancial companies have accumulated an astonishing $1.8 trillion of cash on their balance sheets. By any calculation (for example, as a percentage of assets), this is higher than it has been in almost half a century. Yet most corporations are not spending this money on new plants, equipment or workers. Were they to loosen their purse strings, hundreds of billions of dollars would start pouring through the economy. These investments would probably have greater effect and staying power than a government stimulus.

To be clear: There is a strong case for a temporary and targeted government stimulus. Consumers and companies are being very cautious about spending. Right now, government spending is keeping the economy afloat. Without a second stimulus, state and local governments will have to slash spending and raise taxes, which will produce a downward spiral of higher unemployment, slower growth, lower tax revenue and a larger deficit. Joel Klein, the New York City schools chancellor, told me that when the stimulus money runs out at the end of this year, he will be forced to lay off 5,000 teachers. Multiply that example a thousand times to get a sense of what 2011 could look like.

But government spending can only be a bridge to private-sector investment. The key to a sustainable recovery and robust economic growth is to get companies investing in America. So why are they reluctant, despite having mounds of cash? I put this question to a series of business leaders, all of whom were expansive on the topic yet did not want to be quoted by name, for fear of offending people in Washington.

David Fuller's view Looking beyond the short term, I find that $1.8 trillion of cash on US corporate balance sheets to be one of the few encouraging factors during a painful debt and insolvency crisis for much of the economy, not least government. If corporations are coerced into spending and hiring before management believes that it is in its shareholders' interests to do so, any gains for the economy will most likely be short lived.