Nudges, Agency, Navigability, and Abstraction: A Reply to Critics. Cass Sunstein, March 23, 2015, Paper, "This essay, for a special issue of the Review of Philosophy and Psychology, responds to ten papers that explore the uses and limits of nudges and choice architecture. The essay has three general themes. The first involves the objection that nudging threatens human agency. My basic response is that human agency is fully retained (because nudges do not compromise freedom of choice) and that agency is always exercised in the context of some kind of choice architecture." Link