The Fed's move to lift its key rate by a quarter-point to a range of 0.25 per cent to 0.5 per cent ends an extraordinary seven-year period of near-zero rates that began at the depths of the 2008 financial crisis. Consumers and businesses could now face modestly higher rates on some loans.
The Fed's action reflects its belief that the economy has finally regained enough strength six-and-a-half years after the Great Recession ended to withstand higher borrowing rates.
Rates on mortgages and car loans aren't expected to rise much soon. The Fed's benchmark rate doesn't directly affect them. Long-term mortgages, for example, tend to track 10-year US Treasury yields, which will likely stay low as long as inflation does and investors keep buying Treasurys.
But rates on some other loans, like credit cards and home equity credit lines, will likely rise, though probably only slightly as long as the Fed's rate hikes remain modest.
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For months, Chair Janet Yellen and other Fed officials have said they expected any rate hikes to be small and gradual. But nervous investors have been looking for further assurances.
At the time, Fed officials led by Ben Bernanke were struggling to contain a devastating financial crisis that triggered the worst recession since the Great Depression.
The recession officially ended in June 2009. But unemployment kept rising, peaking at 10 percent before starting to fall. The jobless rate is now at a seven-year low of 5 per cent, close to the Fed's target for full employment.
After the financial crisis, the Fed turned to other extraordinary measures, including a series of bond purchases intended to shrink long-term loan rates. The Fed ended the purchases in October 2014, though it's kept credit loose by reinvesting its bond holdings.
Some analysts expect the Fed to raise rates at every other meeting in 2016, for a total of four quarter-point moves. Others think that after today's hike, the Fed could wait until June before raising rates again.