increase in employment led to Jacob Viner's pessimistic prediction that "in a world organized in accordance with Keynes' specifications there would be a constant race between the printing press and the business agents of the trade unions". Models of wage pressure on the economy needed frequent correction and the standing of Keynesian theory suffered. Geoff Tily wrote ruefully: Finally, the most destructive step of all was Samuelson's and [Robert] Solow's incorporation of the Phillips curve into 'Keynesian' theory in a manner which traduced not only Phillips but also Keynes's careful work in the General Theory, Chapter 21, substituting for its subtlety an immutable relationship between inflation and employment. The 1970s combination of inflation and stagnating economic activity was at odds with this relationship, and therefore 'Keynesianism', and by association Keynes were rejected. Monetarism was merely waiting in the wings for this to happen. Keynes's assumption of wage behaviour was not an integral part of his theory – very little in his book depends on it – and was avowedly a simplification: in fact it was the simplest assumption he could make without imposing an unnatural cap on money income. The writing of the General Theory Keynes drew a lot of help from his students in his progress from the Treatise on Money (1930) to the General Theory (1936). The Cambridge Circus, a discussion group founded immediately after the publication of the earlier work, reported to Keynes through Richard Kahn, and drew his attention to a supposed fallacy in the Treatise where Keynes had written: Thus profits, as a source of capital increment for entrepreneurs, are a widow's cruse which remains undepleted however much of them may be devoted to riotous living. The Circus disbanded in May 1931, but three of its member - Kahn, Austin and Joan Robinson – continued to meet in the Robinsons' house in Trumpington St. (Cambridge), forwarding comments to Keynes. This led to a 'Manifesto' of 1932 whose ideas were taken up by Keynes in his lectures. Kahn and Joan Robinson were well versed in marginalist theory which Keynes did not fully understand at the time (or possibly ever), pushing him towards adopting elements of it in the General Theory. During 1934 and 1935 Keynes submitted drafts to Kahn, Robinson and Roy Harrod for comment. There has been uncertainty ever since over the extent of the collaboration, Schumpeter describing Kahn's "share in the historic achievement" as