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.

Producers, including Alcoa Inc and Rusal, have recently blasted China's swelling exports as a factor behind plunging primary aluminium prices.

Answer: product_or_material_produced