Utilize the input text as a context reference, choose the right relationship between Fonterra and milk 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.

Fonterra said global milk prices had fallen 36 percent in the past 12 months but the cooperative had responded by becoming leaner and more efficient.

Answer: product_or_material_produced