Both concepts developed in the famous book "Nudge" by C. Sunstein and R. Thaler are the foundation to explain how people's decisions and behaviour can be influenced for the better. 

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Choice architecture is the physical, social, and psychological aspects of the context that influence, and in which our choices take place

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A nudge is any aspect of the choice architecture that alters people’s behaviour in a predictable way without forbidding any options or significantly changing their economic incentives

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Today, a growing number of governments and organisations are developing so called "Nudge Units" to advise them on policy or business challenges.