## Comment: Re:Cheaper (Score 1) 349

My theory is that a competitor airline is needed.

AB airlines flys A->B, and also A->B->C. Without any other reason, an A->B->C ticket would cost more or equal to the A->B ticket.

But AC airlines flies A->C, and is charging a smaller price than AB airlines.

AB airlines decides to complete by lowering the price for A->B->C so that it is less or equal to AC airlines A->C price. But they are not competing on A->B so they keep the price higher for A->B.