In every case of problems classes I have seen, in my admittedly limited experience, polynomial time approximation schemes only fail under pathological circumsta

In every case of problems classes I have seen, in my admittedly limited experience, polynomial time approximation schemes only fail under pathological circumstances. I'm not convinced that there's a connection between pathological problem instances and problem sizes, necessarily, and I'm even less convinced that real-world markets would reflect such pathological instances.