Gloomy tales amitriptyline hydrochloride 25 mg dosage Imagine, for instance, an airline that flies three routes. It knows that being able to provide all three routes is essential in attracting profit-generating customers, but on any given day, only one will generate a profit. It doesn’t know in advance which one. So it makes sense to sell tickets on the other routes at a loss–it can’t get rid of them, and there’s no reason to waste the excess capacity.