How Much is That in Real Money?
1 of gold
25 of silver
100 of brass [Orichalcum]
400 of bronze
It is nearly impossible to compare the value of Roman money to that of modern times, for a variety of reasons. The confident parenthetical conversions prevalent in the literature of two centuries ago now pale in the face of a variety of methodolgical quandries. Changes in the total stock and relative prices of gold and silver produce subsantial divergences between ancient and modern prices calculated in the two metals. While estimates of Purchasing Power Parity [PPP] exchange rates offer some basis for comparison, the absence of a remotely common basket of goods clouds the estimates.
Scholars have proposed quite diverging estimates of the monetary stock in Roman imperial times. According to Goldsmith, at the end of the Augustan age the magnitude was in the order of some 7 billion sesterces, 3 billion in silver coins (that is, 2,895 tons of silver) and 4 billion in gold coins (that is, 309,6 tons of gold), plus a small amount of subsidiary coins. A much higher estimate, almost threefold, was suggested, for the '60 of the II century AD, by R.P. Duncan-Jones: roughly 20 billion sesterces, 880 tons of gold and 5,766 tons of silver.
Under a gold standard, exchange rates are not prices, but are more akin to conversion units, like 12 inches per foot, since under an international gold standard, every national currency unit would represent a specific weight of the same substance, i.e., gold. As such, their relationships would be immutable. Since 1492 there had never been a year in which the growth of the world gold stock increased by more than 5 percent in a single year. In the 20th Century, the average was about 2 percent.
During the 1990s the price of silver was consistently about $300 per ounce [$10 per gram]. At these prices, the aureus would be worth about $100, the silver denarius [25 to the aureus] worth about $4, and a sesterce [4 to the denarius] about $1. Taking the modern value of gold at about $1000 an ounce, an aureus would be worth about $300, the silver denarius [25 to the aureus] worth about $12, and a sesterce [4 to the denarius] about $3. As of mid-2010, the price of gold was over $1200 per ounce, placing an aureus at about $325, the silver denarius at about $13, and a sesterce [at 4 denarii] $3.25.
During the 1990s the price of silver was consistently about $4 per ounce [$0.15 per gram]. From 2005 through 2010 the price of silver averaged about $15 per ounce [about $0.50 per gram], briefly reaching as high as $20 per ounce [about $0.65 per gram]. With 3.9 grams of nearly pure silver, the denarius would have been worth about $0.60 in the 1990s, and about $2.00 between 2005 and 2010. By extension, the sesterce, one-quarter of a silver denarius, would have been worth about $0.15 in the 1990s, and about $0.50 between 2005 and 2010.
|Year||Per c.||GDP Index|
In the early Empire, a rate of 4 sesterces [1 Denarius] is suggested as the daily wage by a variety of contemporarneous sources. The daily wage rate for male laborers in Rome under the late Republic was estimated [by Duncan-Jones] as 3 Sesterces. This would suggest a modern equivalence of about 1 sesterce = $0.50, that is 1 denarius = $2.00. Other such calculations could set the value of 1 sestertius as the equivalent of as much as $1.50.
|item||HS||$||$ / HS|
|loaf of bread||HS 0.5||$4.00||$8.00|
|sextarius (~0.5 liter) of wine||HS 1.0||$10.00||$10.00|
|modius (6.67 kg) of wheat||HS 7.0||$1.33||$0.20|
|wheat = 60 pounds per bushel|
According to the price of gold, the sesterce today would be worth $3.25, by the price of silver, the sesterce today would be worth $2.00, according to general labor rates, 1 sesterce = $0.50, while prostitute prices would set the PPP value of the sesterce at somewhere between about $15 and about $50. Various commodity prices would suggest a value of possibly $10.00. Differing methods produce a range in the modern value of the sesterce at somewhere between $0.50 and $50.00, seemingly rendering any conversion to modern prices problematic at best.
To return to Crassus [played by Charles Laughton in the movie Spartacus], his wealth of 200,000,000 sesterce was said to be unprecedented. In 2010 Forbes estimated that Mexican tycoon Carlos Slim Helu was the richest man in the world, with a fortune estimated at $53.5 billion [Bill Gates was only worth $53 billion]. If the sesterce were valued at $10, Crassus would be worth $2,000,000,000. On the Forbes list of rich people, this would place him just behind #463 William Wrigley [chewing gum] but tied with #488 Charles Bronfman [Seagram liquor]. But if the sesterce were valued at $1.00, Crassus would be worth an entirely unremarkable $200,000,000.
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