The most-radical policy decision of Mario Draghi’s 2 1/2 years so far at the helm of the European Central Bank could hinge on a single piece of data. A weak inflation reading on April 30 will probably see the ECB president facing calls to act as soon as next week by imposing negative interest rates for the first time or pushing forward with plans for quantitative easing. Economists in a Bloomberg News survey predict consumer prices rose 0.8 percent this month from a year ago, compared with 0.5 percent in March. A lower-than-forecast number would undermine the ECB’s view that inflation should rebound as temporary ... (full story)