A CFO we know has a ritual at every annual renewal cycle. She pulls up the vendor contract, finds the data export clause, and asks her technology lead one question: “If we left this vendor tomorrow, how long would it take, and what would break?” If the answer takes more than a sentence, she flags the contract for a deeper review.

She is not planning to leave. She is pricing her leverage. And she has internalized something most executive teams have not: vendor lock-in is not binary. It exists on a spectrum, it can be measured, and the degree of lock-in has a direct impact on how much a vendor can raise prices, tighten terms, or degrade service before it becomes rational for a customer to leave.

This piece is a framework for thinking about lock-in risk the way a mature buyer thinks about it: as a measurable exposure, assessable on specific axes, manageable with specific patterns, and sometimes perfectly acceptable. Not every vendor relationship needs to be a clean-room abstraction.…