The Beachhead Test
The segment worth building your marketing around is almost never the one that brings in the most money today.

Save this chart Download
The mechanism
The chart drops four customer segments through three gates: proof a stranger can read, work the team actually wants, and budgets that already overlap your price. The biggest segment, 40 percent of revenue, falls out at the first gate; others drop at later ones. Only a small 3 percent segment passes all three and becomes the beachhead, because how much revenue a segment holds today isn't one of the three tests.
Part of Positioning. Who you are for and why you are the obvious choice.