Lobster, caviar, oysters... the thought of these foods conjures up images of expensive restaurants and special occasions, but it wasn't always this way. In fact, many such treats were once so undesirable they had to be given away! While chicken wings belong in a bargain bucket, right? Well they used to be the most expensive part of the bird. We explain how some foods' fortunes have changed and also look at how some of today’s cheaper foods are set to become a lot more costly...