 However, according to Korsgaard “there need be no such regress if there are principles that are constitutive of the very rational activities that we trying to perform” (2008: 5, 1996b: 164–67, 2009) In this formulation, the principles of practical rationality are constitutive of rational agency, in the sense that they are standards arising from and justified by the nature of the object in question (i.e., the rational agent). More specifically, unless the object conforms to the standard, it ceases to be the kind of object that it is. This is called the ‘constitution requirement.’ If the function of the house is to serve as a habitable shelter, then it must conform to the standard of being a habitable shelter. A thing that does not serve this purpose is not a house. Secondly, some objects make themselves into the kind of objects that they are by conforming to their constitutive standards. This is called the ‘self-constitution requirement.’ Rational agents make things happen, that is, they are efficacious. They exert their efficacy in a specific way, i.e., autonomously. Autonomous agents must conform to the categorical imperative, and in order to be efficacious, they must conform to the hypothetical imperative. It is by conforming to these principles, Korsgaard argues, that one makes oneself into an agent.