For example, in real estate sales you can make money selling houses, listing houses, or both. If you find that 80 percent or your commision is coming from listing houses but it's only taking 20% of the your time, then you should use that knowledge to dedicate yourself to listing houses rather than selling. Doing so could bring you extraoridinary commissions. However, doing so may not necessarily require the massive 100% brain dedication that the author is talking about.