Not always the case (although probably is a lot of the time) - drivers often collect produce direct from the commercial grower, return it to the distribution depot and then it is delivered out to stores within 48 hours.

Interested in this comment, not saying you are wrong but could you give examples of what you mean?

Personally I think the biggest problem with the big supermarkets is that they screw over their suppliers. They are the people being robbed by supermarkets, not the customers.