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Companies are just the current form of industry. Agrarian industry, homestead parents, put tremendous stake on the education of their kids. This wasn't caused by state schooling but itself caused the state schooling, because parents raised kids with the intention to have them study and the education system rose to meet the expectation to facilitate study in whoever was the student, not whoever made the cut. Current system facilitates beating the average, so it becomes a system that competitive companies ask for, a system where only 10% can be at the top anyway.