Reasoning from whom? The interested parties won't tell the truth. In the cited period 1998-2001 Greenspan warned of "irrational exuberance", though he did not e

Reasoning from whom? The interested parties won't tell the truth. In the cited period 1998-2001 Greenspan warned of "irrational exuberance", though he did not exactly do everything he could to stop the bubble either. In reality, opinions from anonymous engineers who know what is being sold may be the best you can get.