Text ( visual ) : unmediated The market economy in the world of today / Per Jacobsson. -- Philadelphia : The American Philosophical Society , 1961. -- x, 77 p. ; 24 cm. -- (Memoirs of the American Philosophical Society ; v.55). -- "Jayne lectures for 1961". -- (BA25776019) ; https://ci.nii.ac.jp/ncid/BA25776019 Author Heading(s): Jacobsson, Per