By Victor Reklaitis, MarketWatch

NEW YORK (MarketWatch) -- In the week ahead, investors will watch to see if there's more pain for small-cap stocks, often viewed as a gauge of the stock market's appetite for risk.

They'll also see if Ukraine fears or other geopolitical worries outweigh what could be another round of upbeat earnings reports and encouraging economic news. That's after U.S. stocks largely ended higher last week even after a missile downed a Malaysian Airlines passenger jet in battle-torn eastern Ukraine.

The Russell 2000(RUT), a key benchmark for smaller-capitalization stocks, lost 0.7% for the week, while the big-cap S&P 500(SPX) and the Dow Jones Industrial Average(DJI) gained 0.5% and 0.9%, respectively. The Russell is down for two weeks in a row and off 1% for the year, but the S&P is up 7% in 2014, the Dow has risen 3.2% and the tech-heavy Nasdaq Composite(RIXF) has tacked on 6.1% after last week's 1.6% gain.

Small caps are "threatening to become an anchor to further gains" by the overall market, said S&P Capital IQ strategist Sam Stovall in a note last week. Meanwhile, Colin Cieszynski of CMC Markets described the Russell 2000's underperformance as "the troops aren't following the generals," meaning the market is showing a lack of breadth that might end with a broader slump.

During the past week, the iShares Russell 2000 ETF(IWM) tested a closely watch chart level, its 200-day moving average, as shown in the adjacent chart. This popular vehicle for betting on small caps last spent time below that level in May, then recovered and scored an all-time closing high on July 1 before pulling back again. (Read more: Small caps usually suffer intra-year drops of 10% or more http://blogs.marketwatch.com/thetell/2014/05/15/russell-2000-in-correction-territory-but-small-caps-usually-suffer-intra-year-drops-of-10-or-more/.)

Central bankers deserve some blame for the small fry's slide. A Federal Reserve report on Tuesday sparked sharp selling in this area of the market, as it said valuations "appear substantially stretched" for "smaller firms in the social-media and biotechnology industries."

While some market watchers criticized the Fed for opining on particular parts of the stock market, David Lebovitz of J.P. Morgan Funds said the central bank is trying to communicate that it's focused on both the economy and the market. Fed officials are saying "it all factors into our broad assessment of the current state of play in the U.S.," said Lebovitz, a global markets strategist.

Ukraine worries vs. earnings, economic data

Investors became more aware Thursday about geopolitical risks after the downed plane in Ukraine and Israel's launch of a Gaza ground offensive. But those worries receded Friday, and they could fade further in the week ahead as 146 companies in the S&P 500 deliver second-quarter earnings.

"It's going to be a battle between the two playing out," said Cieszynski, CMC's chief market strategist. He views second-quarter earnings season as going "really, really well" so far, pointing to big names in a mix of sectors surpassing expectations, such as Intel Corp.(INTC), J.P. Morgan Chase & Co.(JPM) and UnitedHealth Group Inc.(UNH)

FactSet data show 74 companies in the S&P 500 have already posted their second-quarter earnings, and 72% have topped consensus forecasts. In the coming week, notable companies reporting include Netflix Inc.(NFLX), Halliburton Co.(HAL) and Chipotle Mexican Grill Inc.(CMG) on Monday; Apple Inc.(AAPL), McDonald's Corp.(MCD) and Verizon Communications Inc.(VZ) on Tuesday; Boeing Co.(BA), Facebook Inc.(FB) and AT&T Inc.(T) on Wednesday; and Ford Motor Co.(F), Visa Inc.(V) and Caterpillar Inc.(CAT) on Thursday.

"A trifecta of economic data" in the week ahead also could "counterbalance fears brought on by geopolitical concerns," said Kristina Hooper, U.S. investment strategist at Allianz Global Investors. She said the trifecta consists of an inflation reading on Tuesday, reports on home sales and prices on Tuesday and Thursday and manufacturing-related data on Thursday and Friday.

A correction, then more gains?

The stock market has gotten overheated and needs a correction, and that likely will happen in this year's second half as the Fed ends "the liquidity party," said CMC's Cieszynski. After a pullback, he expects a move higher for a couple of years.

"Once we get past that retrenchment and adjustment, you still have a strong underlying economy that's powering corporate earnings quite well," he said. (Read more: A correction is coming, then more years of gains http://blogs.marketwatch.com/thetell/2014/07/11/a-correction-for-stocks-is-coming-then-more-years-of-gains-jim-paulsen/.)

Lebovitz of J.P. Morgan Funds said stocks have "come a long way" in the last few years and are no longer cheap, but they're not yet expensive. "The fundamental picture at the corporate level still looks healthy, and that causes us to think that equity markets could continue their upward march in the U.S.," he said.

Allianz's Hooper said she "wouldn't be surprised to see some sort of pullback" in this year's second half, but she warns long-term investors against sitting in cash or being too quick to sell stocks. ""What we can't stress enough with investors is not letting investor psychology get in the way of making good decisions and meeting long-term goals," Hooper told MarketWatch.

She suggests considering a set-it-and-forget fund with diversified exposure to stocks, bonds and commodities -- such as a target-date fund or an actively managed asset-allocation fund. "A vehicle like that is a great way for investors to sleep at night," Hooper said, "because they don't feel the need to worry about individual components."

More from MarketWatch:

Malaysia Airlines crash triggers risk-off reaction

Brett Arends: We're in the third biggest stock bubble in U.S. history

Chuck Jaffe: Brokerages don't want to put your interests first

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