The Economist Who Refuted Wittgenstein
However, in the Philosophical Investigations Wittgenstein abandons the idea of language as axiomatic representation of the world, and the idea of the ‘unspeakable’. Discussions with [Piero] Sraffa seem to have played their part in his abandonment of the latter. In this connection, there is an anecdote that Wittgenstein himself liked to tell his pupils, one of whom – Malcolm – recounts it thus in his biography of the master: one day, as they were travelling together on the train from Cambridge to London, ‘Sraffa made a gesture, familiar to Neapolitans and meaning something like disgust or contempt, of brushing the underneath of his chin with an outward sweep of the finger tips of one hand’.21
The gesture can only acquire a specific meaning from the context in which it is performed, thus contradicting Wittgenstein’s idea that every proposition had to have a precise place in the axiomatic order of rational language, independently of the various contexts in which it may be employed.22
21: Malcolm, 1958: 69.
22: According to Malcolm (1958: 69), the object of the discussion was Wittgenstein’s idea ‘that a proposition and that which it describes must have the same “logical form”, the same “logical multiplicity”’; according to von Wright, as Malcolm reports in a footnote, the object of the discussion was the idea that each proposition should have a ‘grammar’. In a conversation (21 December, 1973) Sraffa confirmed the anecdote, telling me that von Wright was right.
Roncaglia, A. (2000). Piero Sraffa: His Life, Thought, & Cultural Heritage. New York: Routledge, pg. 23, endnotes pg. 44.
For a brief skeptical discussion of whether Wittgenstein was really refuted, see here.