Behavioural finance is a subfield of behavioural economics. It argues that when people make financial decisions like investing, they are not nearly as rational as traditional finance theory predicts.
Mainstream theory make assumptions in its models that people are rational and free from emotion or the effects of culture and social relations. But behaviourists think that people make financial decisions based on emotions and cognitive biases.
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How to make rational decisions
The role of biases in decision-making
The impact of social norms on decision-making
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The economic theory of expected utility maximization says that people will act out of rational self-interest. But psychologist Daniel Kahneman showed that it is incorrect.
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