Nudging

Nudging literally means “nudging” or “gentle prodding”. It refers to a method used to influence people’s behavior without forbidding them anything. Only how the choices are presented is changed. A classic example: in a cafeteria, the fruit is placed at eye level, the chocolate bars further down. No one is allowed to buy less chocolate, yet more people reach for the apple. The two economists Richard Thaler and Cass Sunstein made this approach well known in a 2008 book; Thaler received the Nobel Prize in Economics in 2017.

Why an apple at eye level is politics

Classical economics long assumed that people make rational decisions. Behavioral research shows something different. We are comfort-seeking, we have little time, and we frequently just take whatever is preset. This tendency toward convenience is not a weakness of individual people, but is well measurable and very stable.

That is exactly why nudging is so effective and, at the same time, so controversial. Governments use it to encourage more people toward organ donation or private retirement savings. Several countries have their own agencies for this, often called “Nudge Units”. The nudges cost almost nothing and still have a measurable effect.

The criticism is: who actually decides which direction people are nudged in? A nudge is always paternalistic, meaning it assumes that someone else knows better what’s good for you. As long as the alternative remains free and the intention is transparent, many consider this acceptable. If the nudge is hidden, it becomes manipulation.

Defaults, social comparisons, and friction

The most powerful tool is the default setting, or simply “default”. It determines what happens if you do nothing. In countries where you have to actively opt out of organ donation, consent rates are significantly higher than in places where you have to actively opt in. The people aren’t different — only the default is.

A second tool is social comparison. Electricity bills that show your own consumption next to that of your neighborhood measurably reduce consumption by a few percent. Added to this are reminders at the right moment, simplified forms, and deliberately built-in hurdles. An extra page before a purchase noticeably slows down spontaneous spending.

Software makes these tools personal. An AI model — that is, a prediction program trained on data — estimates which nudge will work on which person. It tests variants on many users simultaneously and keeps the more successful one. The difference from the cafeteria is precision: the apple is placed somewhere different for each person. The dark version of this is called a dark pattern, i.e., a design that deliberately works against the user’s interests, such as a tiny unsubscribe link.

Nudges in apps, shops, and legislation

You encounter nudges constantly in everyday life. The pre-checked box for a newsletter is one. The notice “Only three rooms left” on a booking site is one. The daily streak in a learning app also belongs here: it exploits the fact that people are reluctant to break a streak they’ve started.

In business news, the term usually comes up in connection with regulation. The EU requires that, for cookie banners, declining must be just as easy as accepting. The Digital Services Act explicitly bans manipulative interfaces on large platforms. Such rules are essentially a dispute over which nudges are still permissible.

A common misconception is equating nudging with advertising. Advertising provides new information or incentives; a nudge only changes the packaging of the decision. And a ban is not a nudge: as soon as an option is removed or costs money, the definition no longer applies. Knowing the difference helps you recognize more quickly when an app is really just nudging you.