HONG KONG (BLOOMBERG) - Oil's surge towards US$100 a barrel for the first time since 2014 is threatening to deal a double blow to the world economy by further denting growth prospects and driving up inflation.

That is a worrying combination for the US Federal Reserve and fellow central banks as they seek to contain the strongest price pressures in decades without derailing recovery from the pandemic. Group of 20 finance chiefs meet virtually this week for the first time this year, with inflation among their top concerns.

While energy exporters stand to benefit from the boom and oil's influence on economies is not what it once was, much of the world will take a hit as companies and consumers find their bills rising and spending power squeezed by costlier food, transport and heating.

According to Bloomberg Economics' scenarios model, a climb in crude to US$100 by the end of this month from around US$70 at the end of 2021 would lift inflation by about half a percentage point in the United States and Europe in the second half of the year.

More broadly, JPMorgan Chase & Co warns that a run-up to US$150 a barrel would almost stall the global expansion and send inflation spiraling to over 7 per cent, more than three times the rate targeted by most monetary policymakers.

"The oil shock feeds into what is now a broader inflation problem," said former long-time Fed official Peter Hooper, who is now global head of economic research for Deutsche Bank. "There's a decent chance of a significant slowing of global growth (as a result)."

Oil is about 50 per cent higher than a year ago, part of a broader rally in commodity prices that has swept up natural gas too. Among the drivers: a post-lockdown resurgence in worldwide demand, geopolitical tensions ignited by oil giant Russia and strained supply chains. Prospects for a renewed Iranian nuclear deal have at times cooled the market.

Still, the rise has been piercing. Just two years ago, oil prices plunged briefly below zero.

Fossil fuels - oil, as well as coal and natural gas - provide more than 80 per cent of the global economy's energy. And the cost of a typical basket of them is now up more than 50 per cent from a year ago, according to consultancy Gavekal Research.

The energy crunch also compounds the ongoing squeeze in global supply chains, which drove up costs and delayed raw materials and finished goods.

Ms Vivian Lau, who runs a global logistics company based in Hong Kong, said her customers are already closely watching rising fuel costs.

"The price of oil is definitely a concern," said Ms Lau, vice-chair and group chief executive officer of Pacific Air Holdings. "The increase is happening at a time when air freight prices are already very high."

Economists are war-gaming scenarios from here.

Goldman Sachs Group, which sees oil at US$100 in the third quarter, estimates that a 50 per cent increase would lift headline inflation by an average of 60 basis points, with emerging economies hit most.

The International Monetary Fund recently raised its forecast for global consumer prices to an average of 3.9 per cent in advanced economies this year, up from 2.3 per cent, and 5.9 per cent in emerging and developing nations.

"With inflation currently at multi-decade highs and uncertainty surrounding the inflation outlook already unprecedented, the last thing the recovering global economy needs is another leg higher in energy prices," HSBC economists Janet Henry and James Pomeroy wrote in a Feb 4 report. "Yet that is what it is getting."

China, the world's biggest oil importer and goods exporter, has so far enjoyed benign inflation. But its economy remains vulnerable as producers are already juggling high input costs and concerns over energy shortages.

With price pressures proving more tenacious than earlier expected, central bankers are now prioritising inflation fighting over demand support. US consumer prices surprising to a four-decade high sent shocks through the system, increasing bets the Fed will raise rates seven times this year, a faster pace than earlier expected.

Bank of England governor Andrew Bailey this month partly justified the decision to raise British interest rates by pointing to a "squeeze from energy prices". European Central Bank president Christine Lagarde said recently that officials will "carefully examine" how energy prices will impact the economy as they signal a shift towards tightening. The Reserve Bank of India last Thursday (Feb 10) also flagged oil prices as a risk.

To be sure, the world economy is no longer the oil guzzler it was during previous decades, especially the 1970s, and alternative energy offers some buffer. Other pandemic-era insulators include swelling household savings and higher wages amid a tight labour market.

In the US, the emergence of the shale oil industry means its economy is less vulnerable to fuel shocks. While consumers are paying more for gasoline, domestic producers are earning more.

Moody's Analytics chief economist Mark Zandi estimates that each US$10 per barrel increase shaves 0.1 percentage point off of economic growth the following year. That compares with a 0.3 to 0.4 point blow prior to the fracking revolution.

Other oil producers will have reason to celebrate too.

Russia's budget, for example, could reap more than US$65 billion (S$87.5 billion) in extra revenue this year, helping buffer the Kremlin against possible sanctions over Ukraine. Other emerging market producers would benefit, as would Canada and Middle Eastern economies.

But for most consumers, and central bankers, much rides on how fast and how far energy goes, particularly if economies lose momentum globally.

"A continued rapid rise can raise risks of recession-like conditions in some countries, especially if fiscal policy is also tightening notably," said Ms Priyanka Kishore of Oxford Economics, which estimates that every US$10 per barrel increase in oil eats around 0.2 percentage point from world growth.

"Hopefully," she said, "this is not the straw that breaks the camel's back."