  Regarding Lewis’s account, critics such as Wayne Davis (2003), Max Kölbel (1998), Stephen Laurence (1996), and Bernard Williams (2002) question whether there is a convention of truthfulness and trust. As Davis and Williams urge, it is hardly obvious that speakers generally speak the truth or generally trust one another, despite frequent claims by diverse philosophers to the contrary. Even if we grant that people generally speak the truth and generally trust one another, does this give me reason to speak truthfully? It does, if I want other people to believe the truth. But if I want them to believe falsehoods, then I have reason to lie rather than speak the truth. Thus, one might object, a regularity of truthfulness and trust is not self-perpetuating in the way that Lewisian convention requires. Expectation of conformity does not provide reason for conformity. In contrast, consider the convention of driving on the right. That convention likewise provides reason for conformity only given an appropriate desire: namely, desire to avoid a collision. The difference is that virtually everyone seeks to avoid a collision, while deception is a normal feature of ordinary linguistic interaction.