The Euro is the currency used by nineteen countries in the European Union. Euro coins and banknotes began to circulate on 1 January 2002. However, their use began three years earlier as an electronic currency. All coins have a common face, while the other face is drawn by each Member State and includes symbols representing the origin and nationality of each country. The euro is the second largest reserve currency and is also the second most used currency in the world. The idea of introducing a single currency in the countries of Europe dates back to the 70s. Initially it had to be called ECU (European Currency Unit). However, ECU is also the designation of an old French currency, and one reason for the name changeover to euro was to favor no country or language.
The American Dollar is the official currency of the United States. The symbol $, is usually written before its numerical value. The first American coins date from 1792, whereas the first notes were only produced in 1862 to cope with the scarcity of coins. Pne dollar coins and dollar bills exist simultaneously, although notes are found more easily. Several countries use the United States dollar as their official currency. In all, 37 million notes are produced per day, but around 95% of these notes are intended to replace others of equal value that have already deteriorated. Of this total of notes that are printed daily, 45% corresponds to the note of 1 dollar. These $1 bills have a life span of approximately one year, while the $100 bills last on average about nine years because they are much less used.