By Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- Investors are bracing for a turbulent week ahead when Federal Reserve policymakers decide whether to start winding down their bond-buying program.

Look for a brief stock pop if a reduction isn't announced, says Steven Wieting, global chief investment strategist at Citi Private Bank. "A small near-term rally now seems likely if tapering is postponed, as most still expect," Wieting wrote. If the Fed starts scaling back the bond-buying program in December, stocks are likely to get hit harder than they did in the summer, when they managed to rise through a spike in bond yields.

But he also said that for long-term investors, the decision to start or delay the tapering will not make much difference.

Joseph LaVorgna, chief U.S. economist at Deutsche Bank, anticipates a $10 billion reduction in Treasury purchases only, leaving the pace of mortgage-backed security purchases intact as the first tapering step. Read: Fed wants to exit QE but keep long-term rates low.

The FOMC convenes on Tuesday for its two-day policy-setting meeting. It's scheduled to announce the verdict on tapering on Wednesday afternoon. The $85 billion bond-buying stimulus added more than $1 trillion to the Fed's balance over the past year, benefitting equity markets, which so far have recorded one of their best yearly gains in a decade.

According to a Wall Street Journal survey, more than half of 46 surveyed economists expect the Fed to announce a reduction in the pace of its bond purchases by the end of January as the economic outlook brightens.

But their forecasts vary for the exact timing of the taper. A fourth of the economists see the central bank announcing an initial reduction on Wednesday, a third expect it in late January and another third see it coming at the Fed's March meeting. Two economists expect the taper to come after March, according to the Journal survey.

Last week, when traders regarded good news as bad news, because it increased the likelihood of tapering, markets endured selling after retail sales figures showed that U.S. consumers spent money more easily in November and particularly on Black Friday.

The S&P 500 (SPX) , which reached a closing high of 1,808.37 last Monday, has gained 24% year-to-date but closed the week with a loss.

The Dow Jones Industrial Average (DJI) has clocked a 20% gain this year. It had a rocky week during which it dropped more than 100 points two days in a row.

The technology-heavy Nasdaq (RIXF) is far ahead with a more- than 32% gain since the start of the year, taking it above the significant 4,000 level.

The three benchmarks lost 1%-2% over the past week. Healthcare and telecoms sectors on the S&P 500 were the worst performers, dropping 2.6% and 2.4% respectively.

Stocks to watch: Nike, Oracle, AMC

Nike Inc. (NKE) takes the mantle as the first blue-chip component to report quarterly earnings after Alcoa Inc (AA) was dropped from the Dow Jones Industrial Average. Nike is scheduled to report its quarterly results on Thursday.

Oracle Corp. (ORCL) and FedEx Corp. (FDX) also report results next week.

AMC Entertainment is scheduled to make its IPO debut next week. The movie-theater chain has been offering moviegoers a chance to buy stock in its upcoming IPO.

Stock moves: Twitter Inc. (TWTR) gained 28% over the past week as investors regarded the company well positioned for selling ads.

Facebook (FB) gained more than 10% over the past week after news it would join the S&P 500 index, replacing Teradyne Inc. (TER)

Lululemon l(LULU) lost 15% of its market cap over the past week after the yoga-inspired apparel retailer warned of a weaker outlook.

Hilton Worldwide Holding (HLT) had a successful IPO debut, jumping 7.5% on the first day on Thursday.

More from MarketWatch:

J.P. Morgan sees 20% gain for S&P 500 in 2014.

5 money moves to make before January.

Week in charts: Stocks, homes boost household net worth.

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