@Olivier5,
In one book (Edward A. Kolodziej: The French Experience and Its Implications for the International System, Princeton University Press, 2014) it is mentioned that it was published in The Economist's edition of September 8, 1984, on page 37.
The footnote unfortunately didn't mention what edition it had been (North America, Europe, Britain, Africa, Middle East, Asia or Latin America) - but I suppose, it was that for North America.