Anomaly, J2014-09-202010-04-011754-9973https://hdl.handle.net/10161/9148The use of antibiotics by one person can profoundly affect the welfare of other people. I will argue that efforts to combat antimicrobial resistance generate a global collective action problem that only a well-designed international treaty can overcome. I begin by describing the problem of resistance and outlining some market-friendly policy tools that participants in a global treaty could use to control the problem. I then defend the claim that these policies can achieve their aim while protecting individual liberty and state autonomy. Finally, I offer some suggestions for a treaty, drawing lessons from the failure of the Kyoto Protocol on climate change and the success of the Montreal Protocol on ozone depletion. © 2010 The Author.Journal article1754-9981