Psychology Today | 28.04.2026 21:09
There is a number that runs most of the world's decisions. Return on investment—ROI—is written in the grammar of financial ledgers: capital deployed, capital returned, time elapsed. Precise. Portable. Easily projected onto slides. The metric travels smoothly across sectors and decades, carrying an authority that feels mathematical but rests, always, on a prior choice: what to measure in the first place.
