What is a nudge?

Answer 1

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It is an economic theory that seeks to create economic behaviors in people through psychology, it is applied in cheap actions, easily accessible and sometimes invisible to the human being. An example is to put images related to cancer in cigarette boxes so that a person when buying cigarettes knows in some way that he is doing harm to his body

Answer 2

To me it's to move someone away from you because they stink too much.

Answer 3

Richard Thaler has founded that even irrationality is accepted, we can still find the best solution without state intervention. People will decide baesd on merrit.

Answer 4

a very gentle push into a certain direction

Answer 5

In economics terms, it's some kind of incentive or other "push" to get economic actors (i.e. consumers, producers) to change behavior. 

An example might be giving people coupons or discounts for fresh vegetables in order to encourage healthier eating.