Americans might not quickly feel the effects of the Fed's first rate cut in over four years.Getty Images; iStock; Natalie Ammari/BIThe Federal Reserve cut interest rates by 50 basis points on Wednesday.But the lag in monetary policy means it'll take time to feel the relief.It'll take a while for mortgage, car loan, and credit card rates to come down.The nation's central bank has finally cut interest rates for the first time in over four years.