Milton Friedman famously used helicopter drops to get money in the system as he couldn’t articulate how money is created and maintained that it is exogenously determined by the central bank or that it should be (as if!) and blurred the two.

I came across the original today – The Optimum Quantity Of Money written by him in 1969.

In addition to helicopters he also has furnaces which the government uses to burn money!

Helicopters appear on pages 4, 5, 11, 13 and 15.

(click to go to the book’s Google Books site)