Earlier quoted context omitted.
A friend worked on a documentary about a major UK supermarket a while back. Talking to them off camera they admitted that their budget range chickens and their regular chickens where identical save the packaging.
I'm not entirely surprised but I don't see where's the incentive for them to behave like this. They double the lines they must carry and are surely to some degree both undercutting themselves and overcharging so reducing sales. Surely they could achieve better results with a mid-range pricing and labelling?
Think of it this way: a rich man is willing to pay up to $10.00 for the chicken breast that his family needs for dinner, but his blue-collar cousin can only afford $6.00 at the most. Had the grocery store only created one line with the price of $8.00, their revenue from these two consumers would be only the rich man's sale, 8 dollars. If, on the other hand, the store had two lines, one for $5 and one for $10, they can make 15 dollars from these two shoppers!
Hope that clears it up.