Euro zone businesses ramped up activity this month, just as the European Central Bank starts printing money to spur growth and inflation, while a slowdown among Chinese factories has fueled calls for more stimulus there. By contrast, Tuesday’s surveys showed signs of an economic pickup in the troubled euro zone, just as ECB policymakers unleash a roughly 1 trillion euro quantitative easing plan. “I wouldn’t want to give QE too much credence at this stage.