Refer to the input text as context and select the correct relationship between 'SABMiller' and 'beer' from the available options.
Options: owned by, position held, operator, product/material produced

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.
product/material produced