The Wealth of Nations by Part 1 Chapter 11 Page 104

the quarter of wheat when this statute was first enacted, and must have continued to be so in the 51st of Henry III.

We cannot therefore be very wrong in supposing that the middle price was not less than one-third of the highest price at which this statute regulates the price of bread, or than six shillings and eightpence of the money of those times, containing four ounces of silver, Tower weight.

From these different facts, therefore, we seem to have some reason to conclude that, about the middle of the fourteenth century, and for a considerable time before, the average or ordinary price of the quarter of wheat was not supposed to be less than four ounces of silver, Tower weight.

From about the middle of the fourteenth to the beginning of the sixteenth