One principle does remain true: central banks should try to keep the economy at near full employment by pushing asset prices up when unemployment threatens to rise. But central banks today are influencing asset prices through a very large number of channels and procedures other than conventional open-market operations: they are trying to affect not just duration discounts but risk, default, and information-driven discounts as well.
有一条原则的确还是对的：当失业率威胁上升的时候，央行应该试图通过促进资产价格上升来保持经济基本实现充分就业。但是今日的央行正通过很多渠道和程序（而不是惯常的开放市场运作）来影响资产价格：他们试图施加影响的不仅是固定期限的贴现，也包括风险,拖欠，和信息驱动的贴现。