Wall Street's post-election sell-off may pick up speed in the coming weeks as worries mount about the looming fiscal cliff and technical weakness suggests a possible correction ahead.

The benchmark Standard & Poor's 500 closed below its 200-day moving average - a measure of the market's long-term trend - on Thursday for the first time in five months, and ended below it again on Friday. More than half of the Dow components are trading below key technical levels.

"I don't think you have to panic here, but I think you really want to be looking for the market to move lower for the next couple of months," said Frank Gretz, a market analyst and technician for Wellington Shields, a brokerage in New York. "I think the next rally is the rally you want to sell." At the heart of the market's worry is whether US leaders can come to agreement on some $US600 billion ($A577 billion) in spending cuts and tax increases that are due to kick in early next year. Some fear dramatic cutbacks could send the US economy into another recession.

Investors will have an extra 24 hours before these scenarios play out this week as the US markets are closed today for the Veterans Day public holiday.

The prospect of higher tax rates in 2013 is driving investors to sell shares as they seek to decrease the tax impact from their positions this year and next.

"You would have thought the fiscal cliff scenarios would have been already mulled over and priced in, but they weren't. It's almost like the market has ADD [attention deficit disorder] and can only focus on one thing at a time," said Natalie Trunow, chief investment officer of equities at Calvert Investment Management in Bethesda, Maryland, whose firm manages about $US13 billion in assets.

The S&P 500 fell 2.4 per cent for the week, its worst weekly percentage drop since June. The index is now down 6.4 per cent from its intraday high for the year of 1474.51 reached on September 14. That drop puts the benchmark index below its 50-day moving average, but not yet into correction territory, defined as a 10 per cent drop from a peak.

Reading the technical signs

The S&P 500 has been trading in a range between the 50-day moving average of 1433.50 and the 200-day moving average of 1380.98 for about two weeks. A significant break below that lower level could be a precursor to further weakness, analysts said.

"There's a technical breakdown in the market that indicates further losses," said Adam Sarhan, chief executive of Sarhan Capital in New York. "A 10 per cent drop is the next big line in the sand." The primary driver of stock prices in coming weeks looks likely to be investor concern about the US fiscal situation.

In a sign of the risks involved, comments by President Barack Obama on Friday about the upcoming negotiations caused stocks to sharply cut their gains.

The president, who defeated Mitt Romney in Tuesday's US election, outlined a position for the fiscal issues on Friday that is far apart from that of his political opponents, suggesting a long battle is to come.

"If the market anticipates a resolution to the fiscal cliff or Europe or any of the other bricks in the wall of worry, we could easily take off," Mr Sarhan said.

Seventeen of the Dow's 30 components are trading below both their 50-day and 200-day moving averages, while another eight are under their 50-day levels, but not their 200. Only five Dow components - Bank of America, JPMorgan Chase & Co , Home Depot Inc, Johnson & Johnson and Travelers Cos - are above both support levels.

Another big negative for the market has been heavy selling of Apple shares. The stock of the world's biggest company, ranked by market capitalisation, lost 5.2 per cent last week, weighing heavily on both the S&P 500 and the Nasdaq . The stock is down 22.4 per cent from its September 21 all-time intraday high of $705.07.

Big retailers' report cards

The election and fiscal cliff concerns, which came on the heels of superstorm Sandy and its devastating effects on many parts of the US Northeast, have captured so much attention that they have overshadowed weakness coming from third-quarter earnings.

With results in from 449 of the S&P 500 companies, third-quarter earnings are now estimated to have declined 0.3 per cent from a year ago, which is slightly better than the forecast at the start of the reporting period. Results have been especially weak on the revenue side, however, with just 38 per cent of companies beating on sales, Thomson Reuters data showed.

But recent stronger economic data, including a report on Friday showing consumer sentiment at more than a five-year high in early November, suggests that retailers, many of which have yet to report, could be among the stronger performers this earnings period.

This week, results are expected from such big names as Target, Wal-Mart and Home Depot.

Consumer discretionary companies have outperformed the broader S&P 500 in earnings, with 72 per cent of the companies in that sector beating analysts' expectations, compared with 63 per cent for the S&P 500 as a whole.

Investors will be paying close attention to those results with the holiday shopping period around the corner, said Rick Meckler, president of LibertyView Capital Management in Jersey City, New Jersey, which oversees about $1 billion in assets.

"It's really the beginning of the Christmas sell season, and I think there's going to be a lot of interest with the outlook for that season and how promotional companies are going to be," Mr Meckler said.

Reuters