Call them what you want.?Bit unfair to quote "child labour" as younger workers are employed in most take away food places and supermarkets. Your other statements only emphasize the simple fact that if you buy in bulk, you get it cheaper.
That's consumerism. You want quality, go to the local farmer's market and butcher. Supply and demand.
Children in the labour force
Bur large companies use them very effectively to cut down on their labour costs .
One observation from living in Europe in the 90s and even as recently as 2012 , and more prevalent in the U.K was the higher number of mature adults employed in fast food and supermarkets.