By Christopher Whittall and Tommy Stubbington 

This month's big fall in the price of oil should be good news for much of the world's economy. But so far markets have been telling a different story.

The MSCI Europe index has dropped 4% since early December, while the S&P 500 index remains 1% lower over the same period despite a rally Thursday after the Federal Reserve said it would be "patient" before raising interest rates next year. Emerging-market countries such as Turkey and India, which are large oil importers and so should benefit from the price slump, have seen their currencies fall sharply against the U.S. dollar.

Analysts remain confident that the 48% drop in the price of Brent crude since its June peak of $115 a barrel is merely a case of delayed gratification for the global economy. Consumers will have more money in their pockets and companies outside of the energy sector will benefit from lower costs. Credit Suisse economists calculate this is equal to a $100 billion tax cut for the U.S. economy alone.

But although the boon is substantial, it will take a while to feed through to economic data. Meanwhile, the effect of investors dumping stocks and bonds related to the energy sector has rippled across financial markets.

"Markets will take the hit before economies get the benefit," said Ewen Cameron Watt, global chief investment strategist at BlackRock Inc., the world's largest money manager, with $4.3 trillion of assets.

Oil exploration and production are costly activities, and U.S. energy companies in particular haven't shied away from tapping financial markets to raise cash.

Energy companies now account for 17% of U.S. high-yield and 12% of investment-grade bonds. They also make up 9% of the MSCI Emerging Markets index, and 8% of both the S&P 500 and MSCI Europe stock indexes.

Stocks and bond markets consequently fell when oil first dipped below $100 in September, with energy companies leading from the front, before staging a rapid recovery the following month as oil prices appeared to stabilize around $85. When oil's free fall shifted up another gear in late November, once again it was energy-related assets that led the downward lurch.

Master limited partnerships, publicly traded securities that don't pay corporate income taxes, took a hammering. NGL Energy Partners LP, an MLP, fell 31%.

High-yield bond funds slumped, experiencing $3.8 billion of outflows last week, which amounts to 0.8% of assets under management, according to Bank of America Merrill Lynch. The yield on Barclays's U.S. Corporate High Yield Bond index rose to 7.3% Tuesday--over a percentage point higher than at the start of the month. Yields rise as prices fall.

Mark Haefele, global chief investment officer at UBS Wealth Management, which oversees around $2 trillion of assets, believes U.S. high-yield bond default rates could rise above 5.5%, from around 2% currently, if WTI crude oil remains below $60 a barrel. With WTI now at $58, he is reducing his exposure to the sector.

The heavy weighting of major oil companies such as BP PLC and Royal Dutch Shell PLC have dragged down the UK's FTSE 100 index 2.7% so far this month, taking its year-to-date performance into negative territory.

The rot even spread to emerging markets that are expected to benefit from the oil-price slump. The Indian rupee dropped 2.7% against the U.S. dollar over the first half of the month, while the Turkish lira sank 7.2%.

"At what price does falling oil create more financial distress than it produces economic benefits? That is the question markets have been trying to focus on in the past couple of weeks," said Toby Nangle, head of multi-asset investment at Threadneedle Investments, which handles GBP93 billion ($145 billion) of assets.

One problem is that the lower oil price is reinforcing the possibility of a default by Russia, notes François Savary, who oversees about $10 billion of assets as chief investment officer at Swiss bank Reyl.

"That would have an impact on financial institutions and economic activity in Europe, and it is making people nervous," he said.

But despite the current skittishness, most analysts still believe the impact of lower oil prices on the real economy will be positive. In the U.S., for instance, the gain for consumers is predicted to outweigh any loss in energy-related investment, which was only around 1% of gross domestic product in 2013, according to Morgan Stanley.

"At the global level we think a lower oil price is very good for growth, although there are regional implications," said Ric Deverell, head of global fixed income and economics research at Credit Suisse. "The problem is the costs are upfront and the benefits are more diffuse: Everyone saves $10 a week filling up their car, while high-yield bonds in the U.S. get hit [more immediately]."

Europe, as an oil importer, should benefit too. As a result, the selloff in European stocks piqued the interest of some investors. European equities should also get a leg-up if the European Central Bank decides to make mass purchases of sovereign bonds next year to ward off deflationary pressures, which lower oil prices will exacerbate.

"Some investors see this as a good entry point--there is buy-in for monetary policy having a very positive impact on European stocks," said Stephane Mattatia, global head of the macro group at Société Générale.

There are already signs of investors putting money to work. Global stock markets rebounded in the latter half of the week following the Fed's dovish statement Wednesday and the stabilization of oil prices around $60. But Mr. Deverell for one believes markets will have to get used to permanently lower oil prices.

Write to Tommy Stubbington at tommy.stubbington@wsj.com

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