Back in the day, in the Chicago Mercantile Exchange, pork belly futures were traded. It was a market that made sense. Year round, pork was produced, the bellies were frozen and in the summer, when demand was high, bellies were defrosted and bacon was produced. So, there was a time lag between the expensive end of production and eventual consumption. This created an opportunity to turn a couple of quid. Weather patterns, political and social attitudes and even religion could have a marked effect on the future price of a bacon, lettuce and tomato sandwich. Traders in brightly coloured jackets, worked the floor of the ‘Belly Pit’ in the Mercantile right up until 2011, squeezing a profit out of pork belly futures.