See Farrell at Crooked Timber has a discussion of the "Knowledge Problem". If I understand, it's the argument that market prices encapsulate a lot of information and provide a key basis for a decision.
Based on that understanding I can agree to support market capitalism, at least partially. The argument depends on the framework that someone is deciding what to buy and when to buy, and the price conveys information.
But as a failed historian I'm struck by the idea that humans make decisions based on history as well. Some of our history-based decisions are also economic decisions; we know what prices were yesterday and have an expectation of what they'll be tomorrow. Or we know how good or bad our last car has been and how good the service from the dealer has been, which has a big impact on which new car we buy and who we buy it from.
But we also have history-based noneconomic decisions with little or no price involvement. We know, or think we know how good or bad a politician or political party has been; the knowledge guides our future.
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