Nudge Theory

Nudge theory :

• proposes positive reinforcement
• indirect suggestions
  as ways to influnce the behavior and decision-making.

A nudge, as we will use the term, is any aspect of the choice architecture that alters people's behavior in a predictable way without forbidding any options or significantly changing their economic incentives. To count as a mere nudge, the intervention must be easy and cheap to avoid. Nudges are not mandates. Putting fruit at eye level counts as a nudge. Banning junk food does not.

• Thaler and Sustein (https://en.wikipedia.org/wiki/Cass_Sunstein "Cass Sunstein")'s book Nudge: Improving Decisions About Health, Wealth, and Happiness

Reference:

• Nudge theory - Wikipedia