Most business decline does not come from bad decisions. It comes from reasonable ones.

Another hire that seemed necessary. Another expense that felt justified. Another expansion that worked last time. Another accommodation to keep things moving.

None of these decisions are irrational. In fact, each often makes sense in isolation. The problem is not the decision itself. It is what happens at the margin.

Marginal decisions are decisions about “one more.” One more unit of output. One more employee. One more location. One more service. One more exception. Each one is small enough to feel harmless. But over time, they accumulate.

Economics pays attention to the margin because that is where direction is determined. The first version of a decision may be beneficial. The tenth may be neutral. The twentieth may quietly erode the business’s ability to adapt.

What makes this dangerous is that nothing looks broken. Revenue may still be coming in. The business may still be profitable. Everyone may still be busy. But the range of future options narrows.

This is how drift happens.

Drift is not caused by neglect. It is caused by repetition without re-evaluation. Yesterday’s good decision becomes today’s habit. Today’s habit becomes tomorrow’s constraint.

Because marginal decisions rarely feel dramatic, they are rarely questioned. But over time, they determine whether the business becomes stronger or merely larger. More capable or merely more complex. Supportive of the owner’s life or consuming it.

When marginal decisions are examined in light of a defined future, drift becomes visible. And once drift is visible, it can be corrected. Not with dramatic overhauls, but with deliberate restraint.

That is how businesses remain coherent over time.