Are there any countries where citizens are free to use any currency?
"Wikipedia has a list of countries which ban foreign exchange use by its citizens.  It's actually quite short but does include India and China. Sometimes economic collapse limits enforcement.  For example, after the collapse of the Zimbabwean dollar (and its government running out of sufficient foreign exchange to buy the paper necessary to print more), the state turned a blind eye as the US dollar and South African rand became de facto exchange. Practicality will limit the availability of foreign exchange even in free-market economies.  The average business can't afford to have a wide range of alternative currencies sitting around.  Businesses which cater to large numbers of addled tourists sometimes offer one or two alternative currencies in the hopes of charging usurous rates of exchange.  Even bureaux de change sometimes require you to order your ""rarer"" foreign exchange in advance. So, while it may be legal, it isn't always feasible." Sounds like you have a goldbug whispering in your ear. The Coinage Act doesn't restrict you from using foreign currency or lawful commodity or service to fulfill a debt. You are free to do that whenever you enter into an explicit or implicit contract with another party. If that wasn't the case, your kid trading his bag of chips for a bag of cookies at lunch would be a criminal act.  It does mean that you ultimately must accept US currency to settle a debt. Following the previous example, if your kid gives his friend the bag of chips, but the cookies get destroyed somehow before being transferred, the friend can offer a couple of dollars to complete the transaction. The whole point of the Coinage Acts is to set a level playing field. If you don't pick one dominant store of value, you have a situation where it is impossible to evaluate the cost of goods and services. It has nothing to do with some competition with foreign currency. A robust, modern economy requires an adequate supply of capital and a common reference point for value within the economy. Think about it further with respect to Article 1, Section 10 of the Constitution. Would you want a fiscally profligate state like California or New York to be able to print money and compel you as a contractor, employee or creditor to accept their scrip as payment? (Or worse, require payment in Gold or Vermont-issued dollars, but pay you in their money.) Of course not. That's why the Federal government controls the currency, and a dollar in Alaska is the same as a dollar in Georgia. If I understand correctly, you're actually asking why there isn't a society whose members generally accept/use any currency for transactions, and just like, Google the exchange rate or something.  The answer is because it's exceptionally inconvenient.  Can you imagine having a wallet with 200 pouches for all the different currencies?  Why would you want to deal with exchange rates all the time?  What if the value of a currency changes?  (A single currency at least has the illusion of being stable).  Et cetera. Shops in most touristic places tend to accept major currencies (at least dollar and euro). I remember a trip in Istanbul before the euro existed, the kids selling postcards near the blue mosque were able to guess your country and announce in your language the price in your currency.
"Currently, there is simply no reason to do so. It's not a problem. It is no more of a problem or effort to denote ""5,000"" than it is to denote ""50.00"". But if there were a reason to do so, it wouldn't be all that difficult. Of course there would be some minor complications because some people (mostly old people presumably) would take time getting used to it, but nothing that would stop a nation from doing so. In Iceland, this has happened on several occasions in the past and while Iceland is indeed a very small economy, it shouldn't be that difficult at all for a larger one. A country would need a grace period while the old currency is still valid, new editions of already circulating cash would need to be produced, and a coordinated time would need to be set, at which point financial institutions change their balances. Of course it would take some planning and coordination, but nothing close to for example unifying two or more currencies into one, like the did with the euro. The biggest side-effect there was an inflation shot when the currencies got changed in each country, but this can be done even with giant economies like Germany and France. Cutting off two zeros would be a cakewalk in comparison. But in case of currencies like the Japanese Yen, there is simply no reason to take off 2 zeros yet. Northern-Americans may find it strange that the numbers are so high, but that's merely a matter of what you're used to. There is no added complication in paying 5.000 vs. 50 at a restaurant, it merely takes more space on a computer screen and bill, and that's not a real problem. Besides, most of the time, even in N-America, the cents are listed as well, and that doesn't seem to be enough of a problem for people to concern themselves with. It's only when you get into hyper-inflation when the shear space required for denoting prices becomes a problem, that economies have a real reason to cut off zeros." If this is your money, and if you can - if asked - prove that you legally made it, there is no limit. You pay taxes on your income, so sending it into the world is tax free. Your citizenship is not relevant for that. Originally dollars were exchangeable for specie at any time, provided you went to a govt exchange. under Bretton Woods this was a generally fixed rate, but regardless there existed a spread on gold. This ceased to be the case in 71 when the Nixon shock broke  Bretton woods. I am a US citizen by birth only. I left the US aged 6 weeks old and have never lived there. I am also a UK citizen but TD Waterhouse have just followed their policy and asked me to close my account under FATCA. It is a complete nightmare for dual nationals who have little or no US connection. IG.com seem to allow me to transfer my holdings so long as I steer clear of US investments. Furious with the US and would love to renounce citizenship but will have to pay $2500 or thereabouts to follow the US process. So much for Land of the Free! "I think the important fact here is that all of our currencies are Fiat Currencies. So currency technically means nothing, because (as you mentioned) the country could print more any time it wants. Now what makes it useful is the combination of two big things: So I would say, we know they owe us 100 ""dollars"", and the dollar is just a word we use to represent value. It is not technically worth anything, beyond the fact that the government controls the amount of that currency in circulation and you trust that people still want more of that currency." TD Bank (Northeast US) has free change counting machines at its branches.  You don't have to have an account to use them. No, there is nothing on the sidelines.       Currency is an investment. There is no such thing as uninvested wealth.       If you had a million in USD at the beginning of 2017, you would currently be out about sixty grand.        There is no neutral way to store wealth. Fist money does not have legal tender.  And technically there are thousands of people willing to fight for bitcoin, who can be seen as an army so in that logic bitcoin has some intrinsic value.  But both don't have intrinsic value. Most sources on the internet I can find agree with that. Wikipedia, investopedia and many others.  Not that money needs intrinsic value. If the market value is 1000 times above the intrinsic value then the intrinsic value is not even relevant. But 1000 * 0 = 0 and the intrinsic value of the dollar itself (not coins) will always be 0. Same for the EUR and then YUAN. Dollars are bits you don't control. The banking system has your bits and they can charge you more bits to move your bits around. At any point, they could freeze your accounts and suddenly you have no bits. It's all designed to make it so you can't function in society without them controlling your bits. There are several local currency initiatives in the US list here.  Most are attempts to normalize a value as a living wage, or encourage local consumption networks.  If you are in the catchment region of one of these, see if you can get a grant or loan to get started (if you are willing to buy into the philosophy of the group such as a $10 minimum wage) m US currency doesn't expire, it is always legal tender.  I can see some trouble if you tried to spend a $10,000 bill (you'd be foolish to do so, since they are worth considerably more). Maybe some stores raise eyebrows at old-style $100's (many stores don't take $100 bills at all), but you could swap them for new style at a bank if having trouble with a particular store. Old-series currency can be an issue when trying to exchange US bills in other countries, just because it doesn't expire here, doesn't mean you can't run into issues elsewhere. Other countries have different policies, for example, over the last year the UK phased in a new five pound note, and as of last month (5/5/2017) the old fiver is no longer considered legal tender (can still swap out old fivers at the bank for now at least).  Edit: I mistook which currency you took where, and focused on US currency instead of Canadian, but it looks like it's the same story there. Any person at any time may produce their own currency, one can even do so on the back of a paper napkin, ripped beer coaster or whatever.  This is NOT a banking privilege, it is within the lawful ability of anyone capable of engaging in commerce. It is called a 'negotiable instrument' ... it gives the holder rights to a sum of money.  Notice that I say 'holder' ... this is what distinguishes it from a non-negotiable instrument, the fact that you don't need to redeem it from source, you can pass it to another who then becomes the 'holder in due course' and thus obtains the rights conferred. The conferable rights over a sum of money (or, indeed, other asset) are themselves 'value' Do banks do this ?  Yes, all the time! ... one of the simplest examples are cheques drawn against the bank, which are considered 'as good as cash'.  Usually they will be drawn out to the order of the person you wish to pay ... but can equally be drawn out to bearer.  The only reasons they resist making out to bearer is : But you can write your own at 'any time' on 'any thing' ... See the apocryphal, yet deliciously entertaining, tale of the 'negotiable cow' This is more of an economics question than personal finance. That said, I already started writing an answer before I noticed, so here are a few points. I'll leave it open for others to expand the list. Advantages Disadvantages Advantages Disadvantages The flip-side to the argument that more users means more stability is that the impact of a strong economy (on the value of the currency) is diluted somewhat by all the other users. Indeed, if adopted by another country with similar or greater GDP, that economy could end up becoming the primary driver of the currency's value.  It may be harder to control counterfeiting. Perhaps not in the issuing country itself, but in foreign countries that do not adopt new bills as quickly. The closest thing that you are looking for would be FOREX exchanges. Currency value is affected by the relative growth of economies among other things, and the arbritrage of currencies would enable you to speculate on the relative growth of an individual economy. Short answer: No. Some of those 'automatic' payments you've agreed to (presumably by signing a PAD form) are initiated in batch by the company whom you're buying from (phone company, cable company etc). So no, the bank has no indication from one day to the next what is coming through.  And the request goes from say, your cable company to THEIR merchant bank to YOUR bank. Typically you have a monthly bill date which is fixed, and they should have terms established when it is due.  If a payment comes back NSF they can retry once - but only for the same amount and I believe it is 14 days from the initial payment attempt.  It makes it predictable, and you'd figure banks would clue in and start to predict for you when things may come out - but strictly speaking your bank doesn't know when or how much.