By William L. Watts, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks started the week on a down note, posting a modest decline Monday as home sales fell in the wake of higher mortgage rates and investors nervously awaited more data later in the week and a meeting of Federal Reserve policy makers.

Losses were limited, however, as a round of weekend deal making fanned hopes for a pickup in merger-and-acquisition activity in the second half of the year, while moving shares of retailer Saks Inc., drug maker Perrigo Co. and advertising firm Omnicom Group Inc.

The S&P 500 Index (SPX) fell 6.32 points, or 0.4%, to settle at 1,685.33, while the Dow Jones Industrial Average (DJI) dropped 36.86 points, or 0.2%, to end at 15,521.97. The Nasdaq Composite (RIXF) declined 14.02 points, or 0.4%, to 3,599.14.

Indexes saw early pressure after the National Association of Realtors said pending home sales fell 0.4% in June, with rising rates blamed for undercutting sales momentum.

Still, the Dow and S&P remain camped out just below record highs, while the Nasdaq is near a 13-year high. Overall, market action remains "very healthy and very constructive," though the market's reaction to upcoming data will be very telling, said Adam Sarhan, chief executive of Sarhan Capital, in a phone interview.

The Federal Reserve meeting, which concludes Wednesday, is the "wild card" for markets given widely held expectations the policy-setting Federal Open Market Committee won't make major changes to its policy statement, Sarhan said.

Investors are closely watching the Fed for any further clues as to when it may begin tapering its purchases of government bonds. Concerns over a slower pace of stimulus was tied to a pullback by stocks last month, though equities soon recovered to see the S&P and Dow head back to record territory.

Meanwhile, it's a very busy week for economic data. Investors will get their first look at second-quarter gross domestic product on Wednesday. Economists surveyed by MarketWatch forecast the data to show the economy grew at an annualized rate of just 1% after a mediocre 1.8% expansion in the first three months of the year.

On Friday, nonfarm payrolls and other labor data are set for release. Economists surveyed by MarketWatch expect payrolls to grow by 175,000 in July after an expansion of 195,000 in June. See: Half full or half empty? Jobs and GDP differ.

Interest rates have also been in the spotlight, as investors weigh whether stocks can continue to advance in light of rising bond yields as market participants consider a potential slowing of Fed stimulus efforts.

MacNeil Curry, head of global technical strategy at Bank of America Merrill Lynch, said that while U.S. Treasurys, particularly the 10-year yield (10_YEAR), have been a driver of global financial markets, the focus is beginning to shift to Japan's Nikkei stock average, which is "on the edge of a significant breakdown and resumption of its larger bear trend." See: Why rising rates aren't killing the stock rally.

Japanese stocks ended at their lowest level in more than a month on Monday, with the Nikkei Stock Average falling 3.3% to 13,661.13.

Curry is targeting a downside correction for the S&P toward 1,671.

Shares of Dow component Boeing Co. (BA) fell 0.8%. The U.S. Federal Aviation Administration has proposed a $2.75 million civil penalty against the aerospace company, saying it failed to correct a problem with fasteners on its 777 airplanes for more than two years after its discovery in 2008.

Caterpillar Inc. (CAT) was the Dow's top gainer, rising 1.2% after the company said it would buy back $1 billion in shares from Societe Generale.

It wasn't a full-fledged "merger Monday," but deal activity over the weekend pushed around some stocks. Analysts said the activity could be a sign that more deal-making is in the pipeline. See Merger Monday: A signal for more M&A in 2013?

Shares of Saks Inc. (SKS) rose more than 4% after the retailer agreed to be acquired by Hudson's Bay Co. in a $2.4 billion, all-cash deal. Read: Saks adds a luxury halo to Canada's Hudson's Bay.

American depositary shares of Dublin-based Elan Corp.(ELN) rose 3.6% after Perrigo (PRGO) said it would use a combination of cash and stock to buy Elan for $16.50 a share, which is a 10.5% premium over Elan's closing price Friday. Perrigo shares dropped 6.8%.

More than half of the companies that make up the S&P 500 have reported earnings so far. And it's shaping up to be the second least-surprising earnings season in four years, according to FactSet. (Read more in The Tell blog http://blogs.marketwatch.com/thetell/2013/07/26/earnings-surprises-running-at-second-narrowest-rate-in-4-years-factset/?mod=MW_latest_news.).

Companies that have managed to beat the Wall Street consensus on earnings so far have done so by only 3.2% -- well below the 4.3% average seen over the past year, and 7% over the past four years.

Shares of Hertz Global Holdings Inc. (HTZ) dropped 2.5%. The car-rental firm reported a 31% rise in second-quarter profit, earning 45 cents a share when excluding one-time items. A survey of analysts found a consensus forecast for earnings of 45 cents. See: Anadarko, Express Scripts in focus Monday.

Shares of Omnicom Group Inc. (OMC) erased an early rise, setting 0.6% lower after it and Publicis Groupe SA said Sunday that they will merge in the biggest advertising industry deal in history.

Simon Property Group Inc. (SPG) said Monday that second-quarter earnings rose 58%. The nation's largest shopping-mall operator logged higher funds from operations to beat analyst estimates and boosted its full-year outlook. Shares were unable to escape the broader downdraft, slipping 0.9%.

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