Please forgive me for interrupting the very interesting exchanges now 
underway, but I need to ask a question now about the terms GNP and 
GDP. Searching JSTOR, I find the first mention of "gross national 
product" in 1923, by Commons, referring to work then at the NBER 
(where he was a director), and the first mention of "gross domestic 
product" in 1951, by J. Stafford of the Royal Statistical Society.
Can anyone send me titles of articles or books about the origin and 
history of these terms, and why in the USA, as I have read, GNP gave 
way to GDP in 1992?

John Womack