The Engine of Human Progress: Idea Sex, Not Just Intelligence
JafarNajafov · x · 2026-08-10
This long-form post explores why humans experienced a sudden explosion of technology and wealth only after 190,000 years of having modern brains. Drawing on Matt Ridley's The Rational Optimist, the author highlights:
- The Power of Exchange: The true engine of human progress isn't just intelligence, language, or agriculture, but the act of trading with strangers.
- Idea Sex: When different groups exchange goods, they also exchange isolated ideas. This fusion creates new concepts that no single individual could invent, a process Ridley vividly calls "ideas having sex."
- The Tasmania Experiment: As a counter-example, Tasmania was cut off from the mainland by rising sea levels. Despite having the same brains, their isolation led not just to stagnation, but to the loss of existing technology, proving that intellectual isolation causes regression.
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