Korsgaard on the foundations of moral obligation

In 'The Sources of Normativity', Christine Korsgaard argues, a la Kant, that we must value the humanity of others ultimately because we must value our own humanity. I examine her argument for the claim that we must value our own humanity. I argue that the sense in which this is so fails to generate a sufficiently robust account of moral obligation and that Korsgaard therefore fails to explain the foundations of normativity