Why it matters
Revenue metrics tell you about decisions buyers made months ago; share of voice tells you about the ones forming now. It's also the clearest way to see a competitor's push early: their voice grows before their sales do, and yours shrinks the same way.
How it works
Pick the surfaces that matter in your category (priority search terms, industry media, the questions people ask assistants) and measure what fraction of the visible answers, results and mentions are yours. Tracked monthly against the same competitor set, the trend is the signal.
What to do about it
Start narrow: your twenty most valuable search queries plus the same questions asked to AI assistants. One spreadsheet, once a month: who appears, who's cited, who's absent.
