Utilize the input text as a context reference, choose the right relationship between SABMiller and beer 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.

However IBISWorld says the increasing dominance of the two largest beer breweries is a growing concern for smaller, less competitive craft breweries, especially those that compete against Lion and SABMiller to secure tap beer deals in pubs and bars.

Answer: product_or_material_produced