This case mentions the following:
Raw material is an extremely commoditized good (milk has a fixed price in the market).
Therefore, the cost of milk cannot be decreased.
I'm confused by this statement, specifically the term “extremely commoditized good".
Since milk has a certain price demanded by the seller, can't the milk be purchased in e.g. bulk quantities to reduce the price further? Why can't the price go down because it's just a commodity?