For those that found my previous post that compared PBCs with the notion of nudging interesting I would highly recommend you read this insightful question and answer (Q&A) session with Richard Thaler, co-author of the book Nudge: Improving Decisions About Health, Wealth, and Happiness.  Specifically, this Q&A specifically discusses what makes up a good nudge.

So let me know your thoughts on whether you think PBCs nudge performance.