To Afford Green Techology Farmers Need Fair Prices Can They Get A Fairer Deal From The Supermarkets?
The "big four" supermarket chains (Tesco, Sainsbury, Asda and Morrisons) now control more than 70% of the UK's grocery market.
That means they are the most likely customers for overseas producers and it gives them enormous buying power. The ability to force down prices for farmers and farm workers comes with it.
Of course, consumers play their part by expecting to buy food cheaply and because it's a cut-throat business the retailers respond.
These two stories from African and Costa Rica, or similar ones, will be familiar to many of us: