William Baumol and William Bowen set out in the 1960s to explain why performing-arts organizations faced a permanent financial squeeze, and found something that governs almost every service business. Productivity in manufacturing climbs relentlessly: better machines, better processes, more output per hour of labor. Productivity in live performance does not climb at all, because the output is the hour. Yet both compete for workers in the same labor market, so pay in the concert hall has to track pay in the factory or the musicians leave for work that pays what the economy now pays. The result is arithmetic, not mismanagement.
Economists named it cost disease, which is misleading, because nothing is sick. The orchestra is not badly run. It is doing work whose value comes from human attention that cannot be compressed, and the price of that attention gets set somewhere else entirely, by the productivity of industries you do not operate in. The same description fits a therapy session, a code review, a hiring loop, an onboarding call, a legal opinion.
This is why service margins narrow in strong economies, exactly when demand looks best, and why the promise to fix a line with efficiency quietly fails on the same tasks year after year. The work that resists automation is the work the disease attacks hardest, so it consumes a growing share of your cost base while appearing on every dashboard as the part of the business that never improves. The useful question is not how to make the quartet play faster. It is which parts of your delivery are genuinely quartet-like, and whether you have priced them as though they will get cheaper.