Circulation and effective demand: a comment on Nell
用简单的漏出和注入方法重新推导了Nell的流通理论，纠正了原文一个小错误，并指出货币供给和乘数过程实际上是同一回事。
In a recent paper in this Journal, Ed Nell presented a theory of circulation intended to unify ‘the theories of money, production, and effective demand’. The current comment uses a very simple leakage and injection approach to arrive at some of Nell's results. In doing so, we are able to correct a small slip in Nell's original paper. More importantly, with the slip corrected, the money supply and multiplier processes are seen to be one and the same.