I would like to build a graph for the price of a loaf of bread based on exchange of silver. My research has shown that some items or commodities have remained very consistent when priced against other commodities. A cow ready for slaughter for one ounce of gold, for example. Obviously there are some historical aberrations to this but usually because of other influences, war, famine or drought as examples. But otherwise these relations hold long term. The reason or need for this graph is to show that only fiat or paper currency suffers from inflation, with the only exception that I know of being Spain, a gold and silver based economy, after conquering the "new world" and bringing home too much gold. Ultimately what I am looking for are historical quotes for the amount paid with dates and, hopefully location. Thanks in advance.