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Predictably Irrational: The Hidden Forces That Shape Our Decisions

value is something that’s based on a social context. The value given to a one-dollar bill is not an objectively attributed value, though that might be a commonsense approach. If one considers its actual cost as printed material, the value is nowhere near a dollar.
Ichiro Kishimi, Fumitake Koga • The Courage to Be Disliked: The Japanese Phenomenon That Shows You How to Change Your Life and Achieve Real Happiness
Behavioral economics is demonstrating that humans don’t always act in self-interested ways, and that transactions themselves have an emotional component.