By MARTIN CRUTSINGERWASHINGTON (AP) â¿¿ The Federal Reserve said Wednesday that it plans to keep interest rates ultra-low even after unemployment falls close to a normal level â¿¿ which it thinks could take three more years. For the first time, the Fed made clear to investors and consumers that it will link its actions to specific economic markers. As long as inflation remains tame, the central bank said it could keep key short-term rates near zero, even after unemployment returns to a more typical rate. Previously, the Fed said it expected to keep interest rates at record lows at least through mid-2015. Now it expects rates to stay low at least until unemployment drops below 6.5 percent â¿¿ a threshold the bank believes may not be crossed until the end of 2015. Analysts said the Fed's new guidance will make it easier for companies, investors and consumers to make financial decisions because they will have a clearer grasp of when borrowing costs will begin to rise. "This approach is superior" to setting a timetable for a possible rate increase, Chairman Ben Bernanke said at a news conference after the Fed held a two-day policy meeting and issued a statement. "It is more transparent and will allow the markets to respond quickly and promptly to changes" in the Fed's economic outlook. Though the Fed's low interest-rate policies are intended to boost borrowing, spending and stock prices, they also hurt millions of retirees and others who depend on income from savings. Bernanke made clear that even after unemployment falls below 6.5 percent, the Fed might decide that it needs to keep stimulating the economy. Other economic factors will also shape its policy decisions, he said. Economists regard a normal unemployment rate as 6 percent or less. "The Fed has become more explicit and more transparent," said Steven Wood, chief economist at Insight Economics. "This should provide the markets with much more clarity around monetary policy action in the upcoming year."