Not shelf space -- shelf placement. An entire new science of how people shop developed in the past few decades. The centermost aisles are prime territory. So,

Not shelf space -- shelf placement. An entire new science of how people shop developed in the past few decades. The centermost aisles are prime territory. So, the higher-margin, fast-turnover items get center aisles and medium height (easily seen) shelves. Wholesalers actually pay for placement rights for things like chips and soda -- that's why they are organized by brand rather than product. Produce gets moved to one end of the store (generally the end nearest the main entrance because produce is low priority for shoplifters.