The School of Real Marketing
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F2-09·F2 — Consumer Behaviour

The Logic of the Irrational

The productive tension

Rational efficiencyandirrational effectiveness

sometimes the 'wrong' answer works better

The synthesis

Consumer behaviour that appears irrational from an economic perspective often follows its own coherent psycho-logic. The best marketers do not dismiss irrationality as error, nor do they abandon rational analysis. They hold both lenses simultaneously: using economic logic to understand the system and psycho-logic to understand the human. The result is solutions that would never survive a spreadsheet but consistently outperform in the marketplace.

Learning objectives

  • Explain Rory Sutherland's distinction between logic and psycho-logic
  • Analyse how costly signalling theory explains apparently wasteful marketing behaviour
  • Evaluate the placebo effect in branding and its implications for product design
  • Identify situations where solving the "wrong" problem produces better outcomes than solving the right one
  • Apply psycho-logical thinking to generate marketing solutions that rational optimisation would never produce

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