One absolutely crazy problem, at least in the UK, is that supermarkets sell pre-packed fruits and vegetables cheaper than the equivalent weight loose. I can't think of any logical reason why.
Produce sold loose have to be nicer, bigger, with fewer flaws. The customers will pick those, and the less perfect produce is left to spoil. You have to remember that the retail prices of produce are as much function of the wholesale cost as it is of the spoilage rates.