For Mangoldt see the following and the papers included in: Kommentarband zum Faksimile-Nachdruck der 1863 erschienenen Erstausgabe von HANS VON MANGOLDT GRUNDRISS DER VOLKSWIRTHSCHAFTSLEHRE, D?sseldorf: Hennings, K. (1980): The Transition from Classical to Neoclassical Economic Theory: Hans von Mangoldt, in: Kyklos, vol. 33. Mosselmans, H. (2000): The omitted mathematics of Hans von Mangoldt, in: Journal of Economic Studies, vol. 27, no. 4/5. Schneider, E. (1960): Hans von Mangold on Price Theory: A Contribution to the History of Mathematical Economics, vol. 28, no. 2. I am inclined to think that Rau and Roscher were not against the cost theory of the English Classical School, making their positions totally eclectic concerning the problem of price formation. Especially you can find almost anything in Roscher?s textbook of economic theory. Indeed he was a great hotchpotch writer. On the whole S and D theory is not so dominant in the German literature in this period. Of course Mangoldt is an exception. Yukihiro Ikeda