Nudges, Regulations and Liberty

Nudge advocates contend that nudges are liberty preserving, while government regulations are not. We interrogate that assumption by considering negative liberty in the forms suggested by the proponents of nudges. Specifically, we examine three ways of measuring negative liberty - liberty as freedom of choice, liberty as absence of coercion and liberty as absence of interference - applying the measures to a case study relevant to the nudge literature: regulations governing healthy food manufacture. We show that, depending on the liberty measure adopted and the estimated impact on producer and consumer behaviour, some regulations can be liberty reducing, while others are liberty preserving or liberty enhancing. When it comes to comparing nudges and more traditional policies aimed at increasing the health and welfare of citizens, there is no a priori negative liberty ground for preferring nudges.