Yellen: Fed's Rate Policy Hinges on 3 'Big Questions'

``In a speech at the Economic Club of New York on Wednesday, Ms. Yellen said a too-low inflation rate is a bigger worry than the Fed's easy-money policies sparking a surge in consumer prices. She also reiterated her arguments from a late-March speech that she sees quite a bit of slack left in the labor market in measures other than the official jobless rate, which stood at 6.7% in March. The comments underscore Ms. Yellen's concern about the economy and labor market as well as the Fed's plan to keep interest rates low for many more months. ''