Is there a financial benefit for buyers from using community currencies?
Short answer: NO, there is no financial benefits for you to expect in a local currency even if some might give tiny discounts on local sales. Local currencies are attractive for small business or communities, they are perfectly legal and starting to be popular in a lot of places. Local currencies encourage individuals and businesses to exchange goods and services locally.  Using them is like investing in your community. It could give you the feeling of doing something good for your community. Check this article for a discussion on the subject.  They should not be considered investments. Local currencies do not offer the same financial security and some could be like monopoly money, but that would be another subject or question to debate.  So, to summarize: no money to be made for your personal use, but some real social and financial benefits for your community. Would'nt that be a kind of personal benefit for you ?
"There are firms that let you do this. I believe that Saxo Bank is one such firm (note that I'm not endorsing the company at all, and have no experience with it) Keep in mind that the reason that these currencies are ""exotic"" is because the markets for trading are small. Small markets are generally really bad for retail/non-professional investors.  (Also note: I'm not trying to insult Brazil or Thailand, which are major economies. In this context, I'm specifically concerned with currency trading volume.)" "Perhaps it's the terminology ""fee"" that makes it a little confusing. I'm not sure whether it's due legislation or if it's tradition but banks and money changers in my country don't charge ""fees"". Instead they advertise separate prices for buying and selling money. For example they'd normally advertise: USD, we buy: 4.50, we sell: 4.65. It's a business. Just like selling cars or lemonade selling money only makes sense if you sell it at a higher price than what you bought it for. Regardless of what you call it it's the profit margin for the seller." Some personal finance packages can track basis cost of individual purchase lots or fractions thereof. I believe Quicken does, for example. And the mutual funds I'm invested in tell me this when I redeem shares. I can't vouch for who/what would make this visible at times other than sale; I've never had that need. For that matter I'm not sure what value the info would have unless you're going to try to explicitly sell specific lots rather than doing FIFO or Average accounting. "Having savings only in your home currency is relatively 'low risk' compared with other types of 'low diversification'. This is because, in a simple case, your future cash outflows will be in your home currency, so if the GBP fluctuates in value, it will (theoretically) still buy you the same goods at home. In this way, keeping your savings in the same currency as your future expenditures creates a natural hedge against currency fluctuation. This gets complicated for goods imported from other countries, where base price fluctuates based on a foreign currency, or for situations where you expect to incur significant foreign currency expenditures (retirement elsewhere, etc.). In such cases, you no longer have certainty that your future expenditures will be based on the GBP, and saving money in other currencies may make more sense. In many circumstances, 'diversification' of the currency of your savings may actually increase your risk, not decrease it. Be sure you are doing this for a specific reason, with a specific strategy, and not just to generally 'spread your money around'. Even in case of a Brexit, consider: what would you do with a bank account full of USD? If the answer is ""Convert it back to GBP when needed (in 6 months, 5 years, 30, etc.), to buy British goods"", then I wouldn't call this a way to reduce your risk. Instead, I would call it a type of investment, with its own set of risks associated." "To speak to this a little more broadly: apart from groups like hedge funds and other investors investing for purely speculative purposes, one of the major purposes of forwards (and, for that matter, futures) for companies in the ""real economy"" is to ""lock in"" a particular price in advance (or to reduce the risk of some kind of investment or transaction). Investopedia defines a currency forward as follows (with a few key points emphasized): [A currency forward is] a binding contract in the foreign exchange market that locks in the exchange rate for the purchase or sale of a currency on a future date. A currency forward is essentially a hedging tool that does not involve any upfront payment. The other major benefit of a currency forward is that it can be tailored to a particular amount and delivery period, unlike standardized currency futures. This can be a major advantage for planning and risk management purposes. For example, if I know I'm going to have to pay $1 million USD in the future and most of my revenue is in Euros, the actual amount I'll have to pay will vary based on the exchange rate between Euros and dollars. Thus, it's very worthwhile for me to be able to ""lock in"" a particular exchange rate so that I know exactly how much I'm going to pay relative to my projected revenue. The goal isn't necessarily to make money off the transaction (maybe they do, maybe they don't) as much as to reduce risk and improve planning ability. The fact that it doesn't involve an up-front payment is also a major advantage. It's usually a bad practice to ""sit on"" cash for a year if you can avoid it. Another key point: savings accounts pay less interest than inflation. If inflation is 3% and your savings account pays 1%, that looks remarkably like a guaranteed 2% loss to me." There's another dimension here as currency conversion isn't necessarily the final answer.  As stated by others, converting money between the three should theoretically end up with the exact same value, less transactional costs.   However the kink is that the price of most products are not updated as the currencies change.  In many cases the price difference is such that even accounting for shipping and exchange fees, purchasing a product from a distributor in a foreign country can be cheaper than just picking it up at the local store.   You might even be able to take advantage of this when purchasing at a single store.  If that store is set up to accept multiple currencies then it's a matter of looking at the conversion rates the moment you are buying and deciding which one is the cheapest route for you.  Of course, this generally will not work for smaller purchases like a cup of coffee or a meal.  Primarily because the fee for the exchange might eclipse any savings. It's very simple.  Use USDSGD.  Here's why: Presenting profits/losses in other currencies or denominations can be useful if you want to sketch out the profit/loss you made due to foreign currency exposure but depending on the audience of your app this may sometimes confuse people (like yourself). At any instant, three currencies will have exchange rates so if I know the rate between A and B, and B to C, the A to C rate is easily calculated. You need X pounds, so at that moment, you are subject to the exchange rate right then. It's not a deal or bargain, although it may look better in hindsight if the currencies move after some time has passed. But if a currency is going to depreciate, and you have the foresight to know such things, you'd already be wealthy and not visiting here. All institutions, financial or otherwise, seek to maximize profits. In a free market, each bank would price its services to be competitive with the current state of the market. Since the currency conversion fee is generally a small part of the decision as to which bank to choose, banks can be non-competitive in this area. If this is an important consideration for you then you would need to find a bank with a lower conversion fee, but be prepared to have higher fees in other areas. TL;DR: The market bears it. Essentially imported goods from the country (in this case the US) that is improving against your local currency will become more expensive. For the most part, that is the only practical effect on you on an individual financial level. Thanks for your reply! I presume then if I don't convert back (say I spend everything) then it's much the same. So my main consideration should be whether I think the currency will increase or decrease in my time away if I'm converting back 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. I don't follow Bitcoin but that seems like a really good service to offer to businesses. It protects their money and it nets out a commission (presumably) on each transaction. Plus, it helps create more acceptance of Bitcoin as a currency which leads to more transactions. Brilliant really. "In my experience working at a currency exchange money service business in the US: Flat fees are the ""because we can"" fee on average. These can be waived on certain dollar values at some banks or MSBs, and sometimes can even be haggled.  If you Google EURUSD, as an example, you also get something like $1.19 at 4pm, 9/18/2017. If you look at the actual conversion that you got, you may find your bank hit you with $1.30 or something close to convert from USD to Euro (in other words, you payed 10% more USD per Euro). And, if you sell your Euro directly back, you might find you only make $1.07. This spread is the real ""fee"" and covers a number of things including risk or liquidity. You'll see that currencies with more volatility or less liquidity have a much wider spread. Some businesses even go as far as to artificially widen the spread for speculators (see IQD, VND, INR, etc.). Typically if you see a 3% surcharge on international ATM or POS transactions, that's the carrier such as Visa or Mastercard taking their cut for processing. Interestingly enough, you also typically get the carrier-set exchange rate overseas when using your card. In other words, your bank has a cash EURUSD of $1.30 but the conversion you get at the ATM is Visa's rate, hence the Visa fee (but it's typically a nicer spread, or it's sometimes the international spot rate depending on the circumstances, due to the overhead of electronic transactions). You also have to consider the ATM charging you a separate fee for it's own operation. In essence, the fees exist to pad every player involved except you. Some cards do you a solid by advertising $0 foreign exchange fees. Unfortunately these cards only insulate you from the processing/flat fees and you may still fall prey to the fee ""hidden"" in the spread. In the grander scheme of things, currency exchange is a retail operation. They try to make money on every step that requires them to expend a resource. If you pay 10% on a money transaction, this differs actually very little from the mark-up you pay on your groceries, which varies from 3-5% on dry food, to 20% on alcohol such as wine." First question:  Any, probably all, of the above. Second question:  The risk is that the currency will become worth less, or even worthless.  Most will resort to the printing press (inflation) which will tank the currency's purchasing power.  A different currency will have the same problem, but possibly less so than yours.  Real estate is a good deal.  So are eggs, if you were to ask a Weimar Germany farmer.  People will always need food and shelter.