 It remains open for discussion how to formulate a norm which is closer to the intuitive idea of transparency, to distinguish various sense of transparency—such as narrow and broad—and to debate whether such transparency is a necessary component of legitimate nudges. Must, for example, the public utility which hopes to encourage energy conservation preface its informational message about the average consumption of your neighbors with the fact that they are sending this information because they think it will encourage conservation? Does it have to disclose they believe it may do so because people have a tendency to conform to what their neighbors are doing?