By the middle of an ordinary weekday you have already decided when to get up, what to wear, what to eat, which messages to answer and in what order, and whether to reply to that one properly or later. None of these is difficult. Collectively they are expensive, and the cost is paid by whatever decision comes next.
What decision fatigue actually is
The idea is straightforward: making choices draws on a limited pool of attention and self-control, and as that pool depletes, the quality of subsequent choices declines. The decline does not show up as obviously bad choices. It shows up as shortcuts, and the two shortcuts are always the same. You either become impulsive, taking the first acceptable option, or you become passive, deferring the decision entirely and taking the default.
The most cited evidence comes from a 2011 study of Israeli parole boards, which found that the proportion of favourable rulings dropped sharply across each sitting and recovered after a food break. The interpretation has been argued over since, and case ordering may explain part of it, but the general pattern, that judgement degrades over a long unbroken run of decisions, has held up across enough settings to be worth taking seriously.
What matters for everyday purposes is not the mechanism but the implication. If your capacity for good decisions is finite, then spending it on what to have for lunch is a straightforward waste.
Sort decisions by what they cost to get wrong
The single most useful habit is to sort decisions before making them, using one question: what does being wrong cost?
Jeff Bezos framed this as one-way and two-way doors. A two-way door is reversible: if the choice turns out badly you walk back through at little cost. A one-way door is not. His argument is that most decisions are two-way doors treated as though they were one-way, and that the resulting slowness is far more damaging than the occasional wrong turn.
For a two-way door, speed beats accuracy. Decide in the time the decision is worth, act, and correct later if needed. For a one-way door, meaning a house, a job or anything involving someone else's health or money, slow down, gather information, and be deliberate. Most of the day is two-way doors.
Four techniques that genuinely work
1. Give the decision a time limit before you start
Set the budget in advance and in proportion: thirty seconds for lunch, ten minutes for a purchase under fifty pounds, a week for a job offer. The point is not the specific number. It is that deciding how long to think is itself a decision, and making it up front stops the deliberation expanding to fill the available anxiety.
2. Use "good enough" instead of "best"
Herbert Simon distinguished maximisers, who search for the optimal option, from satisficers, who take the first option meeting their criteria. Barry Schwartz's later work found maximisers get objectively better outcomes and feel worse about them, because a better option might always have existed. Set your criteria first, then take the first thing that meets them and stop looking.
3. Remove the recurring choices entirely
Anything you decide more than three times a week is a candidate for a rule rather than a decision. Same breakfast on weekdays. Gym on fixed days. A standing answer to a standing question. Rules feel restrictive and are in practice liberating, because they take a whole category of choice off the table.
4. When two options are genuinely close, let something else pick
If you have weighed two options carefully and cannot separate them, that is not a failure of analysis. It is a result: the difference between the options is smaller than your ability to measure it, and more deliberation will not produce a better answer, only a later one.
This is where a coin flip earns its place. Not because chance is wise, but because it ends the loop at a cost of one second. Steven Levitt ran a large experiment on precisely this, inviting people stuck on real decisions to let a coin decide; those nudged toward change reported being measurably happier six months later. The finding says less about coins than about how heavily people over-weight the status quo.
The reaction test
There is a use for randomness that has nothing to do with the random result. Flip the coin, see the answer, and pay attention to your reaction before you act. Relief tells you one thing, a sinking feeling tells you another, and the instinct to go best of three tells you the most of all.
The deliberation was never really about the options. It was about not wanting to admit which one you had already chosen. A coin makes that visible in about a second, which is faster than any amount of thinking.
What not to speed up
None of this applies to decisions that are expensive, slow to reverse, or affect other people materially. Speed there is not efficiency but recklessness. The purpose of clearing the small decisions quickly is to have attention left for the ones that deserve it. If you find yourself reaching for a coin on something that matters, the problem is not the deliberation and no shortcut will fix it. A structured framework will serve you better.