| Feature | | System 2 (Slow Thinking) | | :--- | :--- | :--- | | Operation | Automatic, intuitive, effortless | Deliberate, analytical, effortful | | Speed | Instantaneous (milliseconds) | Slow (seconds to minutes) | | Control | Involuntary (you cannot turn it off) | Voluntary (requires conscious focus) | | Examples | Recognizing anger in a face, driving on an empty road, solving 2+2=4 | Calculating 17×24, checking logic of an argument, parking in a tight spot | | Energy use | Very low | High (burns glucose, depletes with fatigue) | | Error rate | High (systematic biases) | Low (if properly engaged) |

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System 1 is the hero for survival but the villain for statistics. Most of our daily decisions are handed over to System 1 because System 2 is lazy and avoids exertion. Part-by-Part Breakdown of Concepts Part I: The Two Systems Kahneman introduces the famous "bat and ball" problem : A bat and a ball cost $1.10. The bat costs $1.00 more than the ball. How much is the ball? System 1 instantly shouts "10 cents" (wrong). System 2 must override it to calculate the correct answer (5 cents). This demonstrates that even intelligent people fail to engage System 2.