(I&#x27;m the author.)<p>I don&#x27;t disagree that the amount you learn and how well you understand it might accelerate as you advance along the learning curve. My post was more about the &quot;practical&quot; side of knowledge: often knowing 1% or 5% of what an expert knows gets you 30% or 50% or 80% of the practical benefit. The specific numbers don&#x27;t matter -- only the order of magnitude difference between time invested and value extracted.<p>As an extreme hypothetical, consider three sales people, one with 500 hours of experience, one with 5k hours, and one with 50k hours. Each order of magnitude in experience might represent an order of magnitude more knowledge&#x2F;learnings. Or maybe even more! But I doubt that the person with 50k hours of experience closes 10x more sales than the &quot;5000 hour&quot; salesperson, and 100x more than the &quot;500 hour&quot; sales person. It&#x27;s probably more like 2x and 1.1x, respectively. (Or maybe 5x and 3x... but nowhere near 100x&#x2F;10x.)<p>You&#x27;re right about my 30% estimate though -- it&#x27;s just an estimate, and quite possibly a sign of naivete&#x2F;overconfidence. But I do think knowing some of the basics -- even if the knowledge is just through books and shadowing a few sales calls -- would put me ahead of the average person who never learned anything about sales.