Models, thus simplified, suggested policies that seemed to work –&#160;that is, until the plumbing backed up. And the plumbing malfunctioned because herd behavior – shaped by policies in ways that we are only now coming to understand – overwhelmed it.
被如此简化的模型建议的政策似乎有效果——直到金融管道内流向逆转。管道失灵是因为被羊群效应所吞噬。而政策如何造成羊群效应我们现在才开始理解。