Nudge theory is the idea that subtle suggestions, choices, and positive reinforcement can be more effective than commands, rules, and punishment in influencing behavior. This theory has implications for a wide range of fields, including government, education, marketing, and leadership.

Nudges are effective because they engage people in a friendly manner and guide them towards a particular idea or choice without imposing it on them. Because people have a strong sense of autonomy and are motivated to make their own choices, nudges can be a powerful way to influence behavior without coming across as overly controlling or manipulative. By presenting people with a range of options and using subtle cues to guide them towards a desired choice, nudges can help people make decisions that align with their own goals and preferences.

Choice Architecture
Choice architecture is the design of a series of choices with the goal of influencing outcomes. For example, a salesperson may guide a customer through a series of choices for options. Such a presentation may be carefully designed to maximize sales by leading most customers towards expensive choices. Choice architecture typically uses nudges but not always.

Advertising
Advertising that contains no call to action can typically be considered a nudge designed to trigger ideas and emotions as opposed to telling the customer what to think or do.

Nudge in Design
Nudge theory is commonly applied to design. For example, a paper towel dispenser may include a picture of a green forest that gets depleted each time a towel is taken. This may be more effective at reducing consumption than a command such as “only one towel per customer!”