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 in August slashed its farmgate milk price for the coming season by $NZ1.40 to $NZ3.85 per kilogram of milk solids but since then prices have risen at three successive GlobalDairyTrade auctions to arrest a six-month slide.

Answer: product_or_material_produced