Part of the reason for this is that the early part of learning a skill tends to be the best trodden and supported, as everyone begins at the same place. As your skills develop, however, not only are there fewer people who can teach you and fewer students you could have as peers (thus lowering the total market for books, classes, and instructors), but you also start to diverge from those you’re learning from. Whereas two complete novices have quite similar knowledge and skills, two experts might have quite different sets of skills that they’ve already acquired, thus making improving those
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