WASHINGTON — The Federal Reserve reduced its key interest rate by a quarter-point for the third time in a row Wednesday but signaled that it may leave rates unchanged in the coming months.

The cut decreased the Fed’s rate to about 3.6%, the lowest it has been in nearly three years. Lower rates from the Fed can bring down borrowing costs for mortgages, auto loans, and credit cards over time, though market forces can also affect those rates.

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