Utilize the input text as a context reference, choose the right relationship between Alcoa and Aluminium 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.

Aluminium giants Alcoa Inc and Rusal say China's exports have been a factor behind plunging primary prices this year.

Answer: product_or_material_produced