ABSTRACT
THIS short book has a limited purpose. It attempts to present systematically the basic technique of the geometry which is often used for the analysis of trade theory. The representations are not used in this book to solve any economic problems. I have elsewhere tried so to use some of them for some purposes, for example in my article "A Geometrical Representation of Balance-ofPayments Policy" in Economica for November 1949, reprinted in the Mathematical Supplement to Volume I of my Theory of International Economic Policy. But this book is written merely to show how various trade situations may be geometrically represented, so that the student can himself employ the geometrical technique for the solution of the various problems which he subsequently encounters.
