Money was historically an emergent market phenomenon that possessed intrinsic value as a commodity; nearly all contemporary money systems are based on unbacked fiat money without use value. Its value is consequently derived by social convention, having been declared by a government or regulatory entity to be legal tender; that is, it must be accepted as a form of payment within the boundaries of the country, for "all debts, public and private", in the case of the United States dollar.
Operation Bernhard was an exercise by Nazi Germany to forge British bank notes. The initial plan was to drop the notes over Britain to bring about a collapse of the British economy during the Second World War. The first phase was run from early 1940 by the Sicherheitsdienst (SD) under the title Unternehmen Andreas (Operation Andreas). The unit successfully duplicated the rag paper used by the British, produced near-identical engraving blocks and deduced the algorithm used to create the alpha-numeric serial code on each note. The unit closed in early 1942 after its head, Alfred Naujocks, fell out of favour with his superior officer, Reinhard Heydrich.
The operation was revived later in the year; the aim was changed to forging money to finance German intelligence operations. Instead of a specialist unit within the SD, prisoners from Nazi concentration camps were selected and sent to Sachsenhausen concentration camp to work under SS Major Bernhard Krüger. The unit produced British notes until mid-1945; estimates vary of the number and value of notes printed, from £132.6 million up to £300 million. By the time the unit ceased production, they had perfected the artwork for US dollars, although the paper and serial numbers were still being analysed. The counterfeit money was laundered in exchange for money and other assets. Counterfeit notes from the operation were used to pay the Turkish agent Elyesa Bazna—code named Cicero—for his work in obtaining British secrets from the British ambassador in Ankara, and £100,000 from Operation Bernhard was used to obtain information that helped to free the Italian leader Benito Mussolini in the Gran Sasso raid in September 1943. (Full article...)
The one-hundred-euro note (€100) is one of the higher value euro banknotes and has been used since the introduction of the euro (in its cash form) in 2002.
... that memoirist Guy Trebay recalled that the Tenth Floor, a New York City nightclub, attracted "slick and professional gay men who obviously had money"?
The following are images from various currency-related articles on Wikipedia.
Image 1Silver, ½ Karshapana coin, “Babyal Hoard” type, of the Kuru Janapada (450–315 BC) (from Punch-marked coins)
Image 2A 640 BC one-third staterelectrum coin from Lydia. According to Herodotus, the Lydians were the first people to introduce the use of gold and silver coins. It is thought by modern scholars that these first stamped coins were minted around 650 to 600 BC. (from Money)