Washington ? People are saving at the lowest level since the Great Depression, and that could be a problem for the millions of baby boomers getting ready to retire.

In fact, the Commerce Department reported Thursday that the nation’s personal savings rate for all of 2006 was a negative 1 percent, the worst showing in 73 years.

The negative rate means people are spending all of the money they have left after paying taxes – and then some. They are dipping into savings or increasing their borrowing to finance current spending.

Surveys indicate the nation’s spendthrift ways are not likely to change any time soon. More than a third of 2,000 adults questioned recently by the Pew Research Center said they often or sometimes spend more than they can afford.

The young and the poor have the most trouble saving. Some 42 percent of people 18 to 49 said they are likely to spend more than they can afford. Among those with household incomes below $30,000, some 45 percent said the same.

The 1 percent negative savings rate in 2006 followed a 0.4 percent negative rate in 2005. There have been only four years in history that the savings rate has fallen into negative territory. The other two were 1932 and 1933 during the Great Depression.

During the Depression, when as many as one in four people were out of work, households were exhausting savings in order to pay the rent and buy food.

Last year’s negative rate was attributed not to a lack of jobs but to good economic developments – including low interest rates that made it attractive to borrow money to make purchases and also to refinance home loans.

Refinancings gave homeowners an additional $900 billion to spend last year, a big factor in driving the savings rate lower.