Welcome!

Benvenuti in queste pagine dedicate a scienza, storia ed arte. Amelia Carolina Sparavigna, Torino

Showing posts with label Gresham's Law. Show all posts
Showing posts with label Gresham's Law. Show all posts

Friday, March 22, 2019

Hoarding

From Some Notes on the Gresham's Law of Money Circulation

Another problem concerning the “good” money is its disappearance from circulation in private hoards. This usually happened for gold and silver coins. Let us consider some recent examples, one from Italy. The Italian Republic coined some silver coins with a face value of 500 Lire, from 1958 till 1967. They were quite beautiful coins in three series, named “Caravelle”, “Unità d'Italia” and “Dante”. In 1966, Italy started to issue a banknote with the face value of 500 Lire too. The government stopped the coinage of silver coins after 1967, because of two facts. One was the cost of silver, and the other the phenomenon of “tesaurizzazione”. That is, these silver coins were collected into private hoards, disappearing from circulation. This episode is in agreement with the Gresham’s Law: people used “bad” money, the banknotes, in daily transactions instead of “good” money, the silver coins which were collected in hoards.
Silver coins circulated in Canada (until 1968) and in the United States (until 1964 for dimes and quarters and until 1969 for half-dollars). These countries debased their coins, as the market value of silver rose above that of the face value [4], and the silver coins disappeared from circulation as citizens retained them, using the newer coins in daily transactions. Moreover, some individuals were motivated to melt them down and sell the metal for its higher intrinsic value. The 1965 United States half-dollar coins contained 40% silver; in previous years, these coins were 90% silver. “With the release of the 1965 half-dollar, which was legally required to be accepted at the same value as the earlier 90% halves, the older 90% silver coinage quickly disappeared from circulation, while the newer debased coins remained in use. As the price of bullion silver continued to rise above the face value of the coins, many of the older half dollars were melted down. Beginning in 1971, the U.S. government gave up on including any silver in the half dollars, as even the metal value of the 40% silver coins began to exceed their face value” [4].

Hoxne Hoard: Display case at the British Museum showing a reconstruction of the arrangement of the hoard treasure when excavated in 1992. Courtesy: Mike Peel (www.mikepeel.net).

Private hoards are an ancient phenomenon, as archaeology is often demonstrating. It happens that  hoards, usually created with the intention of later recovery by the hoarder, survive and are uncovered in particular by the metal detector hobbyists. In fact, hoards provide a useful method to science for dating artifacts and are considered an indicator of the relative degree of unrest in ancient societies, becoming a snapshot of the period of time during which they have been created [13]. One of the most famous hoards of Roman gold and silver coins was found in the village of Hoxne in Suffolk, England, in 1992. The coins of the hoard date it after AD 407, which coincides with the end of Britain as a Roman province [14].
About the ancient hoards, we can consider what Reference [15] is telling too. If they hadn't have been lost for several reasons, probably they would have been put back into circulation and the coins would have ended up at the mint. It is therefore quite probable that “most silver ultimately found its way back to the mint”.

Questa è una 500 Lire "Caravelle". Si ringrazia il sito 
https://www.nauticareport.it per l'immagine.

Che vocabolo splendido dobbiamo al Latino
RES PUBLICA

Bad quantum money drives out good quantum one

Semi-Device Independent Quantum Money, by Karol Horodecki and Maciej Stankiewicz

The seminal idea of quantum money not forgeable due to laws of Quantum Mechanics proposed by Stephen Wiesner, has laid foundations for the Quantum Information Theory in early ’70s. Recently, several other schemes for quantum currencies have been proposed, all however relying on the assumption that the mint does not cooperate with the counterfeiter. Drawing inspirations from the semi-device independent quantum key distribution protocol, we introduce the first scheme of  quantum money with this assumption partially relaxed, along with the proof of its unforgeability. Significance of this protocol is supported by an impossibility result, which we prove, stating that there is no both fully device independent and secure money scheme. Finally, we formulate a quantum analogue of the Oresme-Copernicus-Gresham’s law of economy.

https://arxiv.org/abs/1811.10552

From the article:
A number (in fact, more than 20) of various quantum money schemes has been recently proposed [1, 5, 6, 9–23]. We then ask if the Oresme-Copernicus-Gresham (OCG) Law of economy (known also as the Gresham’s Law [24–29]) will be also applicable to the quantum schemes of money. If so, the Quantum Oresme-Copernicus-Gresham law would have a form:

Bad quantum money drives out good quantum one

Saturday, July 28, 2018

Antonio Moro, Antoon Mor van Dashorst

Antonio Moro, conosciuto anche come Antoon Mor van Dashorst (Utrecht, 1520Anversa, tra il 1576 e il 1578), è stato un pittore e ritrattista olandese. Nel 1552 dipinse l'Imperatore Carlo V d'Asburgo, mentre nel 1554 a Londra fece il ritratto della Regina Maria I d'Inghilterra

Probabilmente visitò l'Italia nel 1550 dove a Roma imitò alcuni lavori di Tiziano, come la "Danae".
Moro fu inviato dalla Regina Maria dall'Ungheria al Portogallo e tra i ritratti più importanti vi furono quello dell'Infanta Maria, uno della regina Caterina di Portogallo, entrambi conservati nel Museo del Prado, e quello di Re Giovanni III e sua moglie Caterina, conservato a Lisbona. Dopo il suo ritornò a Madrid, dove dipinse il ritratto di Massimiliano di Boemia, fece di nuovo tappa a Roma nel 1552. Alcuni sostengono, ma con prove insufficienti, che uno dei capolavori del Museo del Prado, il ritratto di un ignoto giovane cardinale, da sempre attribuito a Raffaello, potrebbe essere stato dipinto da Moro. Da Roma, si mosse a Genova e infine a Madrid. Nel 1553 fu inviato in Inghilterra, dove ritrasse Maria I di Inghilterra. 

Io conosco questo pittore per via del suo ritratto di Thomas Gresham.


Some Notes on the Gresham's Law of Money Circulation
International Journal of Sciences February 2014 (02)
Amelia Carolina Sparavigna
Polytechnic University of Turin

Abstract
The Gresham’s Law is among the most known laws of economic science. In its popular version, the law is telling that when a government overvalues one type of money and undervalues another, the undervalued money disappears while the overvalued money floods into circulation. Named after Thomas Gresham, a financier of Tudor dynasty, this law was stated by Nicole Oresme and Nicolaus Copernicus. Here we discuss it and follow its long history.

Keywords: Money Circulation, Commodities, Legal Tenders