Nudges, Agency, and Abstraction: A Reply to Critics. Cass Sunstein, May 21, 2015, Paper. “This essay has three general themes. The first involves the claim 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. The second theme involves the importance of having a sufficiently capacious sense of the category of nudges, and a full appreciation of the differences among them. Some nudges either enlist or combat behavioral biases but others do not…” Link