-called fiscal cliff.
The Dow Jones industrial average fell 51 points to 13,140. The Standard & Poor's 500 index gave up 4 points to 1,426. The Nasdaq composite slipped 9 points to 3,012.
In more than a dozen interviews with The Associated Press, conservative activists said they would rather see the country fall off the cliff than agree to any tax increases for any Americans, no matter how wealthy.
With many in Washington away for the holidays, that scenario appears increasingly likely.
"There is starting to become a little bit of an acceptance that we fall off the fiscal cliff," said JJ Kinahan, chief derivatives strategist for TD Ameritrade. "People are starting to think about how they may plan their portfolio if that does happen."
Stocks fell sharply Friday, with the Dow logging its biggest drop in more than a month, after House Republicans called off a vote on tax rates. That left federal budget talks in disarray just days before sweeping tax increases and government spending cuts are scheduled to take effect.
Sen. Joe Lieberman said Sunday that it "It's the first time that I feel it's more likely we'll go over the cliff than not," following the collapse late Thursday of House Speaker John Boehner's plan to allow tax rates to rise on million-dollar-plus incomes. Wyoming Sen. Jon Barrasso, a member of the Republican leadership, predicted the new year would come without an agreement.
Failure to agree on a budget plan before year-end would lead to simultaneous spending cuts and tax hikes that many fear may push the economy back into recession.
President Barack Obama and Congress are on a short holiday break. Congress is expected to be back at work Thursday and Obama will be back in the White House after a few days in Hawaii.
J.C. Penney Co.'s stock jumped after Oppenheimer analysts reiterated a "Buy" rating on the company Monday, saying that traffic in stores in the final weekend before Christmas was strong. The analysts said that this made them more optimistic that the company's new approach to promotion will help it through the holidays and into 2013.
The stock jumped 31 cents to $19.88, putting it among the best performers in the S&P 500.
Other retailers may struggle thought this holiday season though, as Christmas shoppers rein in their spending, their spirits dampened by concerns about the economy and the aftermath of shootings and storms. Marshal Cohen, chief research analyst at NPD Inc., a market research firm with a network of analysts at shopping centers nationwide, estimates customer traffic over the weekend was in line with the same time a year ago, but that shoppers are spending less.
Shoppers are increasingly worried about the fiscal cliff deadline, adding to the fall's retail woes after Superstorm Sandy's passage up the East Coast.
Consumer spending drives about 70 percent of economic growth, so how confident they are about parting with money is crucial for any economic recovery.
Falling stocks outnumbers gainers by a ratio of about four to one in the 30-member Dow, with technology companies leading the decliners. Hewlett-Packard fell 43 cents to $13.92 and Microsoft Corp. dropped 43 cents to $27.02.
Stocks may also come under pressure in coming days as investors who have seen their holdings gain this year, decide to sell and book the capital gains tax in 2012 so as to avoid any potential increase in that tax rate next year, according to Kinahan, of TD Ameritrade.
"People who have had a nice year in a particular stock may say 'why not take the hit this year?'," said Kinahan.
Still, barring a dramatic sell-off in the year's final days of trading, stocks will end the year higher on signs that the U.S. housing market is recovering and the U.S. economy is adding jobs. The Federal Reserve also announced a third-round of its so-called quantitative easing program in September. The program, intended to lower the cost of borrowing and spur lending, helped underpin demand for stocks.
The S&P 500 is currently 13 percent higher for the year, the Dow is almost 8 percent up and the Nasdaq is nearly 16 percent higher.
Trading volumes were lower than average today before the Christmas holiday Tuesday. The stock market will close at 1 p.m. Monday and will reopen Wednesday.
The yield on the 10-year Treasury note rose 1 basis point to 1.78 percent.
Among other stocks making big moves:
—Herbalife Ltd., the nutritional supplements company, fell $1.54 to $25.71. The stock has tumbled 43 percent this month after William Ackman, the founder and CEO of hedge fund Pershing Square Capital Management L.P., claimed that the nutritional supplements company is a pyramid scheme.
AP Writer Steve Peoples contributed to this report from Boston.