Rules Are Easier Than Decisions

Behaviors governed by a rule tend to be more stable than the same behaviors governed by judgment. The difference is not the strictness of the standard but how often it has to be applied.

Judgment reopens the question

Deciding case by case means the question arrives every time the situation does. Each occasion is a fresh negotiation with a fresh set of reasons.

Those reasons are rarely balanced. In the moment, the arguments for the exception are vivid and present while the arguments against it are abstract.

The result is that a reasonable person applying good judgment repeatedly will still drift, because the situation is doing the arguing and it argues in one direction.

A rule shifts what is being asked

A bright line converts a repeated decision into a single one made in advance, under calmer conditions and with the general case in view.

Afterward the question is only whether this instance falls under the rule, which is much easier than weighing it on merits.

This is why no coffee after two o'clock holds better than not too much coffee too late. The second requires an assessment each time and the first does not.

Exceptions are the expensive part

One exception does more damage than the behavior it permits, because it establishes that the rule is subject to review.

Once reviewable, the rule stops removing the decision, and every subsequent instance costs what it cost before the rule existed.

Rules with planned exceptions avoid this. A rule that includes its own carve-out remains a rule, while a rule broken on the day becomes a preference.

Where rules fail

Rules perform badly where circumstances vary widely, because a line drawn for the general case will be wrong in a meaningful share of instances.

They also fail when set too strictly. A rule that cannot be kept in an ordinary bad week gets broken, and a broken rule has no force afterward.

The useful range is narrow: repeated situations, similar enough to each other, where the drift from case-by-case judgment is predictable and one direction is clearly better.

Why rules feel worse than they work

People resist rules because they anticipate the moments the rule will cost them something. Those moments are real and easy to imagine.

What is harder to imagine is the absence of the daily negotiation, which is where most of the benefit sits and which produces no memorable events.

The comparison people run is therefore between a vivid cost and an invisible saving, which understates the case for the rule almost every time.