Can you supply as much milk as you like?I'm not a milk producer, so need educating.
How do many existing contracts work? Can you supply endless quantities of milk at a set price? Or is there some sort of cap. Presumably Tesco only need so much milk?
Yes. Some suppliers pay a premium for a "level profile" (similar amount of milk every month of the year).
Can the processor pay you what they like?
Yes. The majority of contracts do not stipulate a minimum price, and if a company wishes to, it can pay you 1 penny per litre next month. They are unlikely to do this unless facing a major cash crisis, as you will leave them as soon as you can (often 12 months' notice) or go out of business very quickly.