----------------- HES POSTING ----------------- One piece of evidence on the timing of the use of AD-AS graphs in macro teaching is when it first showed up in Samuelson's Economics text. A quick look at my run of Samuelson editions indicates that the first edition to use Aggregate Demand and Aggregate Supply both as concepts and in graph form was the 12th edition which came out in 1985. It was also the first edition co-authored with William Nordhaus. I did not see any mention of AD or AS in the 11th edition which came out in 1980. A possible source regarding the origins of Aggregate Demand and Aggregate supply graphs is an article Robert Barro wrote offering a pedagogical critique of Aggregate Demand and Aggregate Supply -- (if I recall correctly Barro thought the approach was pedagogically deficient and possibly harmful). I think the article came out in the Journal of Economic Education, probably in the late 1980s or early 1990s. Although the article was primarily on the pedagogy of Aggregate Demand and Aggregate Supply, it might also provide some comments on the origin of the approach and overview some of the leading textbooks that used it. David Mitch University of Maryland Baltimore County ------------ FOOTER TO HES POSTING ------------ For information, send the message "info HES" to [log in to unmask]