It's a long way from the coordinated efforts that major central banks made after the 2008 financial crisis erupted and economies began to stall. As governments slashed taxes and spent stimulus money, central banks shrank rates to unclog credit and avert a 1930s-style depression.
Today's diverging central bank strategies aren't without risk. Consider what happened in developing markets last year after Fed officials hinted that they might soon slow the pace of their monthly bond purchases. Those purchases have been intended to keep long-term U.S. loan rates low to encourage borrowing and spur growth.
With the prospect of higher U.S. bond yields, some emerging markets went into a tailspin. Investors pulled their holdings from those countries for fear their value would plunge as capital fled for the United States.
Some emerging economies responded by raising their own rates and bolstering their shaky currencies. The tumult proved temporary. But it showed what could happen once the Fed ends its bond purchases this fall and eventually raises short-term rates — something it says won't happen for a "considerable time" after its purchases end.
Many economists say central banks have no choice but to pursue divergent interest-rate strategies now because of their economies' varying growth rates.
"It just reflects different stages of the economic recovery in different parts of the world," said Stuart Hoffman, chief economist at PNC Financial Services Group. "The U.S. recovery is well ahead of recoveries in Europe and Japan."
Sung Won Sohn, an economics professor at California State University, Channel Islands, noted that the United States acted faster than others to boost growth with aggressive low-rate policies. U.S. regulators have also been more forceful in requiring U.S. banks to raise capital and deal with bad loans. Those actions have contributed to stronger U.S. growth, he said.
Healthier growth prospects and the likelihood of higher rates could make the United States increasingly attractive to investors. Sohn and Hoffman think the U.S. dollar will rise in value, particularly against Japan's yen and the common European currency, the euro, as investors seek rising U.S. yields.
Here's a look at policies being pursued by key central banks:
The Fed has reduced its monthly bond purchases at six straight meetings, from $85 billion a month to $25 billion a month. Chair Janet Yellen has said she expects the Fed to end the purchases altogether this fall. What no one knows is when the Fed will start raising short-term rates. Most economists think it will be in mid-2015. Though U.S. hiring has been strong and the unemployment rate has dropped steadily to 6.2 percent, other gauges of the job market, such as pay growth, remain weak. When Yellen gave the keynote speech in Jackson Hole on Friday morning, she suggested that the Great Recession complicated the Fed's ability to assess those gauges to determine when to adjust rates.
EUROPEAN CENTRAL BANK
Mario Draghi, head of the ECB, is also scheduled to speak in Jackson Hole on Friday. Draghi has noted that the ECB and the Fed are operating on conflicting tracks: The Fed is looking to gradually raise rates while the ECB is sticking with a low-rate policy and is open to doing more if the eurozone economy — which failed to grow at all last quarter — should worsen. Draghi's comments have helped lower the euro's value against the dollar. A cheaper euro makes European exports more affordable and U.S. products more expensive in European markets.
BANK OF JAPAN