The Startling Convexity of Expertise

Don’t divide your attention: focusing on one thing yields increasing returns for each unit of effort.

At a micro level, an extra hour of focus on the current project has a much higher return than an hour on something new, or worse, 5 minutes each on 12 new things. Before you ever do something new, you should understand the opportunity cost vs. exis... See more

They note that for someone new to such practice (citing, in particular, a child in the early stages of developing an expert-level skill), an hour a day is a reasonable limit. For those familiar with the rigors of such activities, the limit expands to something like four hours, but rarely more. The implication is that once you’ve hit your deep work

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Writing novels is hard, and requires vast, unbroken slabs of time. Four quiet hours is a resource that I can put to good use. Two slabs of time, each two hours long, might add up to the same four hours, but are not nearly as productive as an unbroken four. If I know that I am going to be interrupted, I can’t concentrate, and if I suspect that I mig... See more

The economist, philosopher, and writer Henry Hazlitt sums up the dilemma: In the modern world knowledge has been growing so fast and so enormously, in almost every field, that the probabilities are immensely against anybody, no matter how innately clever, being able to make a contribution in any one field unless he devotes all his time to it for ye... See more