How does the currency between countries relate
Firstly currency prices, like any asset, depend on supply and demand. Meaning how many people want to exchange a currency to another one vs. wanting to buy that currency using another currency. Secondly, it really depends on which country and economy you are talking about. In emerging economies, currencies are very often influenced by the politics of that country. In cases like the US, there are a myriad reasons. The USD is mostly governed by psychology (flight to safety) and asset purchases/sales. In theory, currencies balance, given the inflation of a country and its trade with other countries. e.g. Germany, which was always exporting more than it was importing, had the problem of a rising currency. (Which would make its exports more expensive on foreign markets. This is the balancing act.) It's called correlation. I found this: http://www.forexrazor.com/en-us/school/tabid/426/ID/437424/currency-pair-correlations it looks a good place to start Similar types of political economies will correlate together, opposite types won't. Also there are geographic correlations (climate, language etc)
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. "Yes, but it depends on WHICH other currencies the country's money is depreciating against, and to what extent.  This is why China ""pegging"" the renminbi/yuan to the dollar is an issue, it means Chinese goods do NOT become more expensive in the US." The value of the asset doesn't change just because of the exchange rate change. If a thing (valued in USD) costs USD $1 and USD $1 = CAN $1 (so the thing is also valued CAN $1) today and tomorrow CAN $1 worth USD $0.5 - the thing will continue being worth USD $1. If the thing is valued in CAN $, after the exchange rate change, the thing will be worth USD $2, but will still be valued CAN $1. What you're talking about is price quotes, not value. Price quotes will very quickly reach the value, since any deviation will be used by the traders to make profits on arbitrage. And algo-traders will make it happen much quicker than you can even notice the arbitrage existence. It is interesting to consider the Netherlands which is part of the Euro zone. Germany uses 1 and 2 cent coins. Adjacent is the Netherlands where items remain priced to the cent but cash totals are rounded to the nearest 5c so 1 and 2c coins are out of circulation. It's slightly more complicated than that. Usually a country that was in Greece's situation would be able to use inflation to devalue their currency which would have the effect of lowering the value of the government's debts and also of making Greek prices more competitive in the international market. Or they could use quantitative easing to inject cheap cash into the economy to help stimulate it. Because Greece is on the Euro, however, they have no control over their own currency and their options are highly limited. Additionally, when you join the EU, especially the Eurozone, that's supposed to come with additional internal responsibilities, but it's also supposed to come with additional external ones as well. Greece has a responsibility to get its shit together, but the whole point is that more financially stable countries have a responsibility to help them. Right now that means Germany; they're the ones with the greatest control over the Euro and they're shying away from their duties. If the rest of Europe didn't want to risk ending up in this position they shouldn't have let Greece into the Eurozone. "I think you missed the first two paragraphs of the article. It's raising the prices in some countries in Europe due to local tax increases, and in addition to that it's changing the currencies used in the countries you listed.  The only thing about the title that may be considered ""misleading"" is the use of ""across the word"" instead of ""across Europe""." Chinese suppliers can quote their price in CNY rather than USD (as has been typical), and thus avoid the exchange risk from US dollar volatility- the CNY has been generally appreciating so committing to receive payments in US dollars when their costs are in CNY means they are typically on the losing end of the equation and they have to pad their prices a bit.  Canadian importers will have to buy RMB (typically with CAD) to pay for their orders and Canadian exporters can take payment in RMB if they wish, or set prices in CAD. By avoiding the US dollar middleman the transactions are made less risky and incur less costs. Japan did this many decades ago (they, too, used to price their products in USD).  This is important in transactions of large amounts, not so much for the tiny amounts associated with tourism. Two-way annual trade between China and Canada is in excess of $70bn.  Of course Forex trading may greatly exceed the actual amounts required for trade- the world Forex market is at least an order of magnitude greater than size of real international trade. All that trading in currency and financial instruments means more jobs on Bay Street and more money flowing into a very vital part of the Canadian economy.  Recent article from the (liberal) Toronto Star here. Two parties will agree to pay each other's interest obligations. This is generally for one of two reasons:   * One party wishes to swap a fixed interest rate (eg coupons on a bond) for a floating interest rate (eg: payments on a loan). If their counterparty wishes the opposite, and the rates are acceptable to both, they will agree to swap their obligations  * There are two firms, based in countries A and B. Each firm has a branch in the other's country, and these branches each have a loan, denominated in that other countries currency. To reduce each firm's exposure to FX risk, they can swap their obligations, so A will pay interest on B's loan (which is in A's currency) and B on A's loan (which is in B's currency).  edit: removed infuriating unterminated bracket. When you buy a currency via FX market, really you are just exchanging one country's currency for another. So if it is permitted to hold one currency electronically, surely it must be permitted to hold a different country's currency electronically. "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." of course the value will be non zero however it would be very small, as all the countries would not leave at once...  if its a piig holding the bag it would fall precipitously, if its a AAA (non france) it would go to 1.5  Its very path dependent on whom leaves when From Indian context, there are a number of factors that are influencing the economic condition and the exchange rate, interest rate etc. are reflection of the situation. I shall try and answer the question through the above Indian example. India is running a budget deficit of 4 odd % for last 6-7 years, which means that gov.in is spending more than their revenue collection, this money is not in the system, so the govt. has to print the money, either the direct 4% or the interest it has to pay on the money it borrows to cover the 4% (don't confuse this with US printing post 2008). After printing, the supply of INR is more compared to USD in the market (INR is current A/C convertible), value of INR w.r.t. USD falls (in simplistic terms). There is another impact of this printing, it increases the money supply in domestic market leading to inflation and overall price rise. To contain this price rise, Reserve Bank of India (RBI) increases the interest rates and increases Compulsory Reserve Ratio (CRR), thus trying to pull/lock-up money, so that overall money supply decreases, but there is a limit to which RBI can do this as overall growth rate keeps falling as money is more expensive to borrow to invest. The above (in simplistic term) how this is working. However, there are many factors in economy and the above should be treated as it is intended to, a simplistic view only. Whether it's historically stronger or weaker isn't going to have an impact on you; the forex exposure you have is going forward if the exchange rates change you will have missed out on having more or less value by leaving it in a certain currency.   (Ignoring fees) Say you exchange €85 for $100, if while you're in the US the Euro gets stronger than it currently is, and the exchange rate changes to €8:$10; then you will lose out on €5 if you try to change it back, and the opposite is true if the euro gets weaker than it currently is you would gain money on exchanging it back.  Just look at it as though you're buying dollars like it were a commodity.  If the euro gets stronger it buys more dollars and you should've held onto it in euros, if it gets weaker it buys less dollars and you were better off having it in dollars.  You would want to use whichever currency you think will be weaker or gain the least against the dollar while you're here. What you want is the average change in rate of the Australian Dollar against multiple other currencies, to even out the effect of moves in a single other currency. People often look at the trade-weighted exchange rate to get an idea of this, as it allows you to look at the currencies that are most relevant, rather than every tiny other currency having an equal weight. From an investor's standpoint, if the value of crude oil increases, economies that are oil dependent become more favourable (oil companies will be more profitable).  Therefore, investors will find that country's currency more attractive in the foreign exchange market.