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I suspect the answer to the book's title, "how did solar get so cheap?" is mostly efficiencies of scale, which means the lack of demand was the main thing keeping solar expensive, and the failure to keep buying more solar to make solar cheaper was a simple and epic failure.

Which jives with a story where the market-dominating tech hasn't fundamentally changed in forty years and "Leading companies in Japan, Germany, and the US lost their solar business in part by investing in alternatives."