There are plenty of recession naysayers. Average hourly wages and salaries have not fallen, and some economists argue that unless  or until  that happens, consumer spending will hold up despite widespread economic unease. According to these economists, what happened in December was a temporary blip.

“Incomes have managed to hold up,” said Chris Varvares, president of Macroeconomic Advisers, an economic forecasting firm, who added that the data to date did not support the view that a recession was inevitable.

Even in tough economic times Americans rarely reduce their consumption, preferring instead to slow the growth in their spending. Since 1980, they have cut spending in only five quarters  a total of 15 months  most of them in the depths of a recession. The 2001 recession passed without a cutback in consumer spending.

Only once before, in 1980, did consumer spending fall during a presidential election year, helping Ronald Reagan in his campaign against Jimmy Carter, the Democratic incumbent.

Official statistics do not yet show that consumer spending has dropped, but they do suggest that in late 2007, it slowed in areas like automobiles, furniture, building materials and health care, said Mark M. Zandi, chief economist at Moody’s Economy.com.

Fresh evidence of a pullback is pouring in from many quarters as Americans confront the triple threats of higher energy costs, falling home prices and a volatile stock market.

Perhaps the strongest barometer over the last 30 days is the performance of the country’s big chain stores. December turned out to be a blood bath for retailers at every rung on the economic ladder, with sales for the month growing at the slowest rate in seven years.