Kahneman later codified his research in the 2011 bestseller Thinking, Fast and Slow.3 Man, he wrote, has two systems of thought: System 1, our animal mind, is fast, instinctive, and emotional; System 2 is slow, deliberative, and logical. And System 1 is far more influential. In fact, it guides and steers our rational thoughts. System 1’s inchoate beliefs, feelings, and impressions are the main sources of the explicit beliefs and deliberate choices of System 2. They’re the spring that feeds the river. We react emotionally (System 1) to a suggestion or question. Then that System 1 reaction
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