I've often heard conspiracy theorists say that if dentists ever learned of a way to cure cavities more cheaply and without drilling, they'd suppress the information as it would endanger their business. I think this is insane, but can anyone offer a sound economic argument for why dentists would embrace the new technique instead of cartelling up to suppress it?
Because capitalism. Dentists are not a cabal but a loosely affiliated set of individuals. As soon as one local dentist start filling teeth pain-free with great long-lasting results, all the other dentists had better adapt or they will go out of business.
Also, I'd argue that capitalism is what causes the entrenchment of industries that get addicted to their profits and don't care about the customers.