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A cursory look at some of the key economic facts could make that a fairly heroic assumption. The housing market, having enjoyed a boom that puts even our recent run to shame, is cooling rapidly and there is now at least a decent chance it will turn into a fully fledged crash. Even a gradual cooling could be bad news for consumer spending, which has been fuelling US growth.
Then there is the giant trade deficit, which is nearing $800bn (£430bn), of which over a quarter is with China - the key supplier of most of America's consumer durables. And there is also the worry about the inverted yield curve, which means that government bonds not due to be paid for 20 years or more are more expensive than shorter-dated ones. This is usually taken as predicting a recession.
Craig Heron, manager of New Star's fund of funds range, agrees that an inverted yield curve has predicted seven of the past eight recessions - but it has happened 12 times, so there have been times when it has not been followed by recession. He believes.....continued below
And, so far, the signs are that the housing slowdown has not stopped US consumers from spending. Jeremy Tigue, manager of the Foreign & Colonial investment trust, says the decline in the oil price is also a positive. He expects the housing market to slow a little more than our own did last year.
'The surprise about the US economy is company profits,' he added. 'We are in the middle of the third-quarter reporting season and there has been a surprising lack of bad news, despite the oil price and housing problems. So far, it all looks pretty positive.'
That does not mean earnings can continue to grow at such spectacular rates as they have seen. Mike Lenhoff, equity strategist with Brewin Dolphin, thinks analysts' forecasts are still too high and 'they are now starting to revise their numbers. That does not mean there will be no earnings growth, but their numbers have been too ambitious.'
He warns that the market is susceptible to disappointment - if, for example, a number of companies warn that analysts' expectations are still way too high, the stock market will be vulnerable. But, he believes, the downside is limited by the fact that investors believe that, if the economy starts to look shaky the Federal Reserve will react by cutting interest rates. 'That is the rosy scenario - and investors have been right to believe that rosy scenario for the past three years. They will wait to be proved wrong,' says Lenhoff.
That is borne out in a chart, left, produced by Lenhoff, which shows that the price-earnings ratio of the S&P 500 - a key measure of stock market valuations - has been falling steadily over the past five years as the index itself has been rising, reflecting the strong growth in earnings across the US corporate sector.
At around 14 times expected earnings, the ratio is little over half the peak of the bubble years. Of course, the ratio is only as good as analysts' earnings forecasts - and if these fall sharply, the p/e ratio will rise, making it look rather more expensive. Both Heron and Tigue have been more positive on the US recently: Heron had virtually nothing American in his main global funds, but has recently added funds from Brown Advisory and Legg Mason; F&C has around 20 per cent of its assets there.
But choosing a fund is not easy. Justin Modray at BestInvest points out that the record of British fund managers in the US is poor: only 31 per cent manage to beat the index over any three-year period and, in most periods that fell to just 21 per cent. That is partly because the S&P is such a well researched market that it is hard to spot the kind of anomalies that make outperformance possible. Indeed, most US retail funds specialise in particular areas - like large-cap growth or mid-cap value - which helps their performance.
Modray adds that investing in the US adds currency risk. Many commentators think a weaker dollar is the only way for the US to deal with its soaring deficit - bad news for investors. His favourite fund is also one of Heron's key choices: Bill Miller's Legg Mason US Equity, which buys stocks Miller thinks are too cheap and waits for them to recover.
Guardian Unlimited © Guardian Newspapers Limited 2006