Krebs can do all sorts of multiplications, like
5*1.6% = 8% and then even add 4% to it to arrive at 12%At least he know the differences between percent and percentage points
Yea, surely qualifies him.
Problem with this guy is not that he's a bad economist, he's just an incredibly lazy slacker, to the point that he prefers doing these silly kind of multiplications instead of a serious analysis. That's what this kind of "analysis" is really revealing.
Why should he do better when everyone at ifo, DIW, IAB advises policy alike?