[sokoloff]

When Publix lets me see inside the market because they have the lights on, lets me not shiver because they have the heat on, or lets me use a shopping basket without charging for it, they're also "eat[ing] some costs in order to generate more profit".

Surely GP's text should be ever-so-slightly charitably read to mean overall/aggregated costs, not that each and every individual cost is passed on.