The Revenue Model Mirror
If a client's own business isn't built on monthly income, your monthly fee never stops being a question.

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The mechanism
The chart tracks two clients across four renewals. The client whose own money comes in every month climbs steadily as renewals pass quietly. The client with no monthly rhythm holds flat, then drops at each renewal as the price gets re-argued every time. Same work either way - the renewal fight isn't about quality, it's that your fee has a rhythm the client's business doesn't.
Part of Productization. How you package and price the work.