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Sorry, the manufacturing learning curve. The most widgets you make, the cheapest they get. The effect was absolutely stunning for batteries and solar panels (https://ourworldindata.org/grapher/price-of-lithium-ion-batt...).

We make too few nuclear power plants for them to have a noticeable learning curve, and recently each subsequent one ends up more expensive than the latest, notably because of safety regulation. Korea and I think China had the best success in that regard (and France in the 80s) by being able to make real series, but you don't really see those now except maybe China.

More here: https://ourworldindata.org/learning-curve



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