1. The reference is to A. C. Pigou, The Theory of Unemployment (London: Macmillan, 1933).
2. Bryce, Douglas, Salant and Thring refer to Sir William Beveridge on unemployment — William Beveridge, Unemployment: A Problem of Industry, 2nd edn (London: Longmans, 1930)
3. and Causes and Cures of Unemployment (London: Longmans, Green, 1931).
4. The reference is probably to Irving Fisher, Appreciation and Interest (Cambridge, Mass.: AEA, 1896)
5. and/or The Theory of Interest (New York: Macmillan, 1930)