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The two-system theory

There are two thinking systems, each with distinct characteristics.

  • System 1, or intuition. We think in this way most of the time. We respond to the world in ways that we're not conscious of and don't control. System 1 operations are fast, effortless, associative, and emotionally charged. They're governed by habit, so it's more difficult to modify or control.
  • System 2, or reasoning. It is a deliberate reasoning system. It's slower, serial, effortful, and controlled.

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