Horizontal PDPs are relatively uncontroversial, but vertical PDPs can unleash severe criticism, with skeptics claiming that they involve “picking winners.” But, as the examples given above suggest, the line between horizontal and vertical policies is inevitably fuzzy.
这时就需要纵向政策——让具体部门收益的政策——登场了。横向生产性发展政策相对来说正以较少，但纵向生产性发展政策可能招致严厉的批评，质疑者称它们涉嫌“挑选赢家”。但是，上述例子表明，横向和纵向政策之间的界线难免模糊。