Effective Bandwidth

You know, in principle, that a tired mind thinks poorly. What is less known is how much: being preoccupied — with money trouble, with worry, with hunger — consumes measurable intelligence, roughly a night's sleep or a dozen points of tested capacity.

The image to keep: the mind is a road with a fixed number of lanes. Worry parks trucks in several of them. The traffic of thought still flows, but slower, and the driver thinks the road itself has shrunk.

This reframes the poor decision of the overwhelmed person. It is not character; it is congestion. The man juggling debts makes worse choices about debts — not despite his worry but because of it. Scarcity eats the very capacity needed to escape it.

So two rules. For yourself: make the big decisions on clear mornings, not in the crowded hours. For judging others: before you call someone foolish, ask how many lanes of their road are currently occupied. Capacity is situational. So is kindness.