Originally Posted by xliioper

It may be due to historical business flying fare discrimination practices (as business flyers tend to be less price sensitive than leisure flyers). Business flyers often book multi-city trips to visit multiple clients and in most cases they will likely need a layover of more than 4 hours to visit a client (thus creating a fare break). Cheaper fares can also have fare combination restrictions (such as requiring A-B-A routing, aka, they can only be booked on a one-way or roundtrip ticket).