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> I disagree- The value of something is "what you can get someone to pay for it." That is the only concrete, objective, and rational way to determine value.

That's perfectly fine, after all value, whatever definition we use, is just a model, nothing that exists outside of humankind. The problem with the definition you prefer, though, is the substantial subset of the economy that will not be available on a market. An economy consists of significantly more production and consumption than what gets sold on a market and therefore gets a price. Examples: Producing free software in your free time, creating music, training kids in a sports club, raising your own kids, teaching for free via youtube channels or moogs or locally etc. All these thing create, well, value, I'd say. They boost both wealth and efficiency of the economy.