Failure demand is demand caused by a failure to do something, or to do something right, for the customer. The idea comes from systems thinking, and it is the simplest useful lens we know for a service operation.
Value demand is why you exist: a customer wants to make a claim, open an account or report a fault. Failure demand is everything that follows when the first attempt does not work. "Where is my refund?" "You sent me the wrong form." "What does this letter mean?" "I was told someone would call back."
Three things make it worth your attention.
It is large
In most operations we measure, failure demand is between a fifth and a third of all contact. Every one of those contacts has a cost, and most create more work behind them.
It is hidden
Standard reports count contacts by channel and by product. They rarely ask why the customer got in touch, so failure demand sits inside the averages, looking like ordinary work.
It is controllable
Failure demand has causes inside your organisation: an unclear letter, a broken handoff, a promise nobody keeps. Fix the cause and the demand disappears for good.
Start by asking frontline staff to record why customers get in touch, in the customer's words, for two weeks.