WASHINGTON (AP) — Federal Reserve Chair Jerome Powell underscored the U.S. economy’s ongoing weakness Tuesday in remarks that suggested that the Fed sees no need to alter its ultra-low interest rate policies anytime soon. Powell’s comments are in contrast to increasing optimism among many analysts that the economy will grow rapidly later this year. That outlook has also raised concerns about a potential surge in inflation and fueled a sharp increase in longer-term interest rates this year. Most economists say they think the Fed’s continued low rates, further government financial aid and progress in combating the viral pandemic could create a mini-economic boom as soon as this summer.