An OECD report suggests that there is little difference in volatility between exchange-traded agricultural commodities (such as wheat and corn) and non-exchange-traded ones (such as apples and onions).
The exhibition boasts computer-generated "fly-throughs" of the new Corn Exchange, the new Exchange Square and the centrepiece of Manchester's rebuilt shopping area - the biggest Marks and Spencer store in the world.
Corn futures prices on the Chicago exchange have risen about 50 percent since mid-June, hitting all-time record levels last month, and other grains such as wheat and soybeans are also sharply higher.