One of my biggest bugbears is the poor quality of supermarket bananas, and how the inferior “dollar” bananas we do get are doing no end of harm to people who farm small-holdings in the Caribbean.
This long piece from Observer Food Monthly goes through the whole thing in detail and is well worth a read.
Anyway, if you don’t read that link, just remember to always buy Caribbean bananas and preferably Fair Trade ones. Apart from anything else – they taste much nicer.