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I have give many reasons, but to try and sum it up, anyone going on a flight nearly always wants a return fare. Single fares are invariably advertised alone, with no way of finding out how much it costs to get back. It IS dubious, as it is like selling a new car for �500 (wheels excepted). You phone up and find the wheels are �7000.
Though the second example is both impossible and ridiculous, the first one isn't. It means travel companies CAN (note, I don't say DO) mislead customers by making the return back from Amsterdam a standard price only, making the total price paid for a return no more economical as buying a cheap return to start with. Until you call, you just don't have the slightest idea, and buy obliging you to call they then have the chance to hard sell you whatever else they can. Retailers have been stopped already from displaying false sale prices, but still manage to both advertise non-existent flights (illegal but difficult tp prove) and this latest trick, only common in newspapers for a year or so, in my experience. And yes, the bee in my bonnet is I am a law teacher who has taught contract law for many years up till a few years ago, and I know how many ways businesses earning millions in profits will try to earn a little more without being totally honest.
How is anyone supposed to know what the return flight will be from these ads? Most will assume it's the same both ways. If it was, they wouldn't be doing it, they'd be advertising returns. Therefore, by advertising singles, they've got something to hide. I close the case for the prosecution, my Lord.