Henry Charles Lea,
A History of the Inquisition of Spain…
“ With the Revolution the old coinage passed away and was replaced by the decimal system, the peseta and céntimo being equivalent to the French franc and centime. Yet still prices continue to be quoted in reales, which are now rated at 25 céntimos, or about 5 cents of American money.Nothing is more difficult than to ascertain accurately the variation in the purchasing power of money, but perhaps the price of labor affords the most trustworthy standard. ”
