Utilize the input text as a context reference, choose the right relationship between Starbucks and coffee from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Some big retailers, such as coffee chain Starbucks Corp (SBUX.O) and Costco (COST.O) offer health coverage to part-time employees.

Answer: product_or_material_produced