Libertarian paternalism
Steering people toward better choices while fully preserving their freedom to choose.
What it means
Libertarian paternalism is the guiding philosophy behind nudging: the claim that it is both possible and legitimate to design choice environments so that people are steered toward decisions that make them better off (the paternalist element) while leaving them genuinely free to go their own way at little or no cost (the libertarian element). Thaler and Sunstein argued the position is not a contradiction but a recognition that there is no neutral choice architecture — some arrangement of options, defaults, and framing is unavoidable — so the relevant question is whether that arrangement is designed to help the chooser. The mechanism relies on interventions that influence behavior without removing options or materially changing incentives, such as setting helpful defaults, ordering and framing choices, and reducing friction. It is genuinely contested: critics question who gets to decide what counts as 'better off,' worry that nudges can manipulate by exploiting biases rather than informing, and ask whether preserving formal freedom is enough when defaults are so powerful that few opt out. It matters because this doctrine underpins the work of nudge units and a vast range of public and private policy, framing an ongoing ethical debate about influence, autonomy, and transparency.
Examples
Automatically enrolling employees into a sensible pension plan (the paternalist nudge) while letting anyone opt out costlessly with a single form (the libertarian safeguard).
Putting fruit at eye level in a school canteen and chips at the back of the counter changes what pupils eat, while the chips stay on sale at the same price.
An energy supplier places new customers on the renewable tariff by default, priced identically to the standard one, with a single click to switch away.
First described in Thaler & Sunstein (2003).