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System 1 vs System 2 Thinking: Behavioural Economics for A-Level

Geoff Riley

21st April 2025

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In this video, we're exploring a powerful and exam-relevant concept from behavioural economics — System 1 and System 2 Thinking. These ideas challenge the traditional view that consumers are always rational decision-makers. Instead, the late, great Daniel Kahneman — a Nobel Prize-winning economist — argued that we have two systems of thinking:

System 1 vs System 2 Thinking: Behavioural Economics for A-Level

🧠 System 1 & System 2 Thinking – Summary:

Human decision-making runs on two tracks:

System 1 is fast, intuitive, and emotional — great for snap judgments, but prone to bias.

System 2 is slow, logical, and effortful — better for careful analysis, but often lazy and switched off.

Coined by Daniel Kahneman, this dual-process theory shows why people don’t always act rationally. It’s a core idea in behavioural economics, explaining everything from anchoring bias to nudges.

In short: We think fast… until we’re forced to think slow.

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Geoff Riley

Geoff Riley FRSA has been teaching Economics for nearly forty years. He has over twenty years experience as Head of Economics at leading schools. He writes extensively and is a contributor and presenter on CPD and Revision conferences in the UK and overseas.