The philosopher David Lewis is credited by many social scientists, including mainstream economists, with having founded the modern (game-theoretical) approach to conventions, viewed as solutions to recurrent coordination problems. Yet it is generally ignored that he revised his approach, soon after the publication of his well-known book. I suggest that this revision has deep implications (probably not perceived by Lewis himself) on the analytical links between coordination, uncertainty and rationality. Thinking anew about these issues leads me to map out an (...) alternative social scientific research programme. The traditional ontological equipment of methodological individualism should be reinforced in order to admit the existence of an “intersubjective” world beside the two familiar worlds: the “objective” world of observable things, and the “subjective” world of expectations and individual beliefs. In particular, language becomes necessary to understand coordination via conventions, rather than the other way round. That has led a group of institutionalist economists and pragmatist sociologists to develop an enlarged model of rationality, no longer isolated from questions of coordination and values. This model is the basis for the “Economics of Conventions”. (shrink)

In the Philosophical Investigations, Wittgenstein is sometimes claimed to hold a redundancy theory of truth. The main evidence to support this view, however, comes from a single passage, number 136, which has been misinterpreted. In this essay I argue for an alternative interpretation of the critical passage in question. The purpose behind Wittgenstein’s remarks is not to provide a general theory of truth, per se. Rather, Wittgenstein uses the section as a way to introduce his notion of fit, a notion (...) that will play a more substantial role in his later arguments on following rules. Furthermore, if Wittgenstein did hold something close to a redundancy theory of truth, such a view would illuminate remarks from the earlier notebooks about a crucial Tractarian view rather than his later view from the Investigations: the so-called “Picture Theory”. (shrink)