Every operator has a best-seller list.
It gets passed around on Monday mornings. It lands in review meetings and board decks. It tells you what's selling in units, in net sales, in market count, in margin dollars.
It doesn't tell you what the consumer actually chose.
That answer lives in frequency - how often a consumer picks a product when they walk in. It is the single most powerful metric for a multi-location operator. It normalizes what otherwise can't be compared: different builds, different dayparts, different volumes, all read on one scale.
And hidden inside that signal is a threshold that matters more than it sounds.
1%.