Amazon spent a lot of time analyzing Whole Foods' distribution technology, pointing to a possible way in which the company sees the most immediate opportunities to reduce costs, said a person familiar with the matter who asked not to be identified because the issue was private. Experts say the most immediate changes would likely be in warehouses that customers never see. That suggests the jobs that could be affected the earliest would be in the warehouses, where products from suppliers await transport to store shelves, said Gary Hawkins, CEO of the Center for Advancing Retail and Technology, a Los Angeles nonprofit that helps retailers and brands innovate.