Walmart has an interesting approach. They let whichever supplier has the best sales in a category design the shelving layouts for ALL suppliers in that category

Walmart has an interesting approach. They let whichever supplier has the best sales in a category design the shelving layouts for ALL suppliers in that category. If you abuse your rights you lose your category captain status. That means if Pepsi has the best sales they decide where Coke goes on the shelf. Pretty clever. At one point when coffee wasn’t a big section, the category captain of coffee actually helped bring in competitors to increase the overall size of the shelf space and thus attract more passing customers.