Food and finance

Sure, you've seen Trading Places. But do you know about the history of futures contracts, or why some things are traded on commodities markets and others aren't? I didn't, not really. So I spoke to Kara Newman, food writer and author of The Secret Financial Life of Food. One of the things Kara is keen to stress is that where money is involved, there's always a temptation to cut corners, and her book is full of delicious food-based scandals. One of her favourites is The Great Salad Oil Swindle. I...