Another interesting price fact: the price of bulk wheat has stayed relatively constant in British pounds for the last 800 years or so, staying at about 1 pound per bushel. We've had more inflation in the price of wheat in the last ten years than we had in the previous 800. A bushel of wheat contains about 66,000 calories. So that laborer making 2£/year wouldn't be able to afford wheat -- that's one reason the food price list has a price for oats, but not bread or wheat.