That's like saying that the rules of chess describe instead of prescribing. Perhaps it doesn't say anywhere that you should play chess. But neither does it sugg

That's like saying that the rules of chess describe instead of prescribing. Perhaps it doesn't say anywhere that you should play chess. But neither does it suggest that the rules of chess "describe human play better than the rules of any other game." Capitalism describes a system where ownership over all capital is marketized. A society can adhere to that system or not. Under Feudalism, for example, land ownership is instead attached to hereditary titles. You can argue that Capitalism is the best economic system for a society, but it is hardly the only one. In fact, compared to the millenia for which Feudalism lasted, Capitalism is very, very recent.