“In terminal decline?” The Economist, http://www.economist.com/research/articlesBySubject/displayStory.cfm?story_id=3536178&subjectid=348873, 6
Comments like this make London-based The Economist the greatest magazine, ever. It is found in the print edition on page 14. For greatest effect, read outloud with a stuffy British accent.
Pedants will complain that we have ignored dollars sitting in bank accounts, but after a couple of free in-flight gin-and-tonics, most frequent fliers care little about the difference between M0 (the narrowest measure of the supply of… money) and M3.