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| The dismal science|
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“”...money can be a lot of things. It can be something that is hoarded, fought over, protected, stolen and withheld. Or it can be like an energy, fueled by the desire, will, creative interest, need to laugh, of large groups of people. And it can be shuffled and pushed around and pooled together to fuel a common interest...
Money is anything which serves as a means of exchange, a store of value, and a unit of account and represents only an extremely small fraction of the real wealth of any given society or country where it is used. Throughout history money has taken many different forms, such as sea shells, whale teeth, cocoa beans, pieces of electrum stamped with the seal of the king, and stone wheels. Most people tend to think of "money" as being synonymous with coins, or cash. But they are, in fact, two distinct things and have separate histories.
Types of money
The first forms of money were used to take account of gift exchanges, typically in a ritualized ceremony when buying a wife, or as compensation for a murder or an injury to another, for example. Most resources were not traded for money and did not have any kind of monetary value assigned to them at all. When money was exchanged, it was usually meant to represent a relation between the two parties and not the value of the objects traded. During these exchanges, sometimes something as simple as a wooden stick could be used to represent an amount that was owed, as well as a promise to pay it back. Money in the form of coins made of rare metals were not used until the iron ages when large scale warfare made it necessary to have a unit of exchange that wasn't backed only by personal relationships, trust, and promises.
Traditionally, money was backed by some sort of commodity, such as gold or silver, and there are some who liked it much better that way. Today, most money is "fiat currency" which has no intrinsic value except as determined by the government. Cranks often claim that with the lack of a commodity to back them, dollars are worthless, forgetting that gold is just a shiny yellow metal that, for much of history, especially back before its high electrical and thermal conductivity gave it practical use, was only valuable because people decided it was.
Furthermore, "fiat" does have some solid backing; taxes. People with property must acquire money in order to pay their property tax, and the Big Bad Gummint doesn't accept Monopoly money. So even if everyone suddenly decided that things were better when you could sell your daughter for 5 goats, people are still going to accept money. Some countries have a useless one-cent coin that costs more to make than it's worth.
Cryptocurrency is a form of digital currency that uses cryptography to maintain control, and the only form of digital currency that works to any degree. Digital currency is a type of currency that only exists in the digital realm. Two forms exist, centralized and decentralized.
Centralized means it is controlled by a central bank, which itself is usually controlled by a government. Essentially, this form is the same as real-world currency except for it not existing in the physical world. While it hasn't been applied yet, hypothetically in the future, centralized fiat crytocurrency would be something to replace real-world currency with. The other kind is decentralized cryptocurrency.
Decentralized cryptocurrency is a form of virtual currency using cryptography to maintain control. Virtual currencies are digital currencies that are completely decentralized. If you want to know what this is, the best known example is Bitcoin, or barely legal fake money if you prefer. Unfortunately, in spite of it being completely decentralized, it is used in dozens of countries worldwide, but luckily isn't the official currency of any recognized country. These are often supported by libertarians, minarchists, anarcho-capitalists, laissez-faire capitalists, Conservapedians, technophiles, and criminals due to them being completely outside the government. However, this can lead to the issue of drastic changes coming out of nowhere, and it can be used as a commodity at best, and will get you arrested at worst.
- Bitcoin: When you want to play with imaginary money.
- Gold standard (economics): When you want to play with soft, highly conductive, money.
- Inflation: When your money is worth less.
- Liberty Dollar: When you want to play with real, but incredibly illegal, money.
- Monetary policy: When you just want to play with a lot of money.
- United States Dollar: When you're tired of using loonies.
- Greed: What happens when you have too much money.
- Sound money: No, it's not Bitcoin for musicians, but an aversion to fiat money (and often a weasel word for gold buggery, which is a specific variant of sound money).
- Louis C.K. "A Statement from Louis C.K. (December 13, 2011)." LouisCK.net. 2011 December 13. 
- Technically, there are still a few coins in circulation that one could melt down for the metal, but it really isn't worth the effort.
- Death to Pennies (CGP Grey)
- Cryptocurrency on Wikipedia
- Digital Currency on Wikipedia
- Virtual Currency on Wikipedia
- What is Bitcoin and how does it work?, Mashable