Who arranges products on store's shelves

The rack of chips in a store from Frito lay would be considered as a rack jobber.

They set up and maintain displays and stock them with goods that are sold on consignment. Retailers depend on rack jobbers for the provision of health and beauty aids, hosiery, books, greeting cards, and magazines.

Murray Rubin has written:

'Rack jobbers and supermarkets'

Jobbers specialize in cutting the fabric, which they then supply to contractors for sewing.