Peter Groenewegen and Klaus Hennings both have written on the switch in focus from production to exchange, and the related development from "political economy" to "economics." They both have some relevant entries in the New Palgrave, I believe. Hennings also has a chapter in FOUNDATIONS OF ECONOMICS, edited by Mauro Baranzini and Roberto Scazzieri, Blackwell, 1986, called "The Exchange Paradigm and the Theory of Production and Distribution. In the same volume, Krishna Bharadwaj has a chapter on "Production and Exchange in Theories of Price Formation and Economic Transition" that also is relevant to your query. It is also of note that, as Garegnani points out in his New Palgrave entry on the "surplus approach to value and distribution," there is a difference in the classical and neoclassical treatments of both production and exchange. Mathew Forstater