Studios benefit from these deals as they no longer have to pay to produce cassettes and discs themselves, and nor will they have to work out what to do with warehouses full of unwanted tapes when demand falls.

BBC: Movies on the web

Not only that, but this takes place after summer driving season, when demand typically falls off.

FORBES: Why Spring Means Higher Gasoline Prices

At that time, three years of good weather produced bumper crops, and deep price falls when demand fell in world markets at the same time.

ECONOMIST: True grit