Why are some countries' currencies “weaker”?
1:30 is not stronger than 1:79. These are just numbers. Trading 1:120 in 2008 and 1:79 now vs. trading 1:31 in 2008 vs 1:30 now is much better criteria to look at to evaluate the strength of the currency, and if you look at that you can see that the Japanese Yen is significantly stronger than the Bhat. While Yen gained 25% to its worth, Bhat gained nothing over the same period of time. You can also see that the Yen was very consistent, while Bhat was volatile over that period. "The answer from littleadv perfectly explains that the mere exchange ratio doesn't say anything. Still it might be worth adding why some currencies are ""weak"" and some ""strong"". Here's the reason: To buy goods of a certain country, you have to exchange your money for currency of that country, especially when you want to buy treasuries of stocks from that country. So, if you feel that, for example, Japanese stocks are going to pick up soon, you will exchange dollars for yen so you can buy Japanese stocks. By the laws of supply and demand, this drives up the price. In contrast, if investors lose faith in a country and withdraw their funds, they will seek their luck elsewhere and thus they increase the supply of that currency. This happened most dramatically in recent time with the Icelandic Krona." "You may as well ask why a piece of wood is 25 centimeters long but only 10 inches. Most units of measure are very arbitrary. Somebody decides that this amount of heat or distance or money is a convenient unit, and so that's what they use. Suppose that tomorrow the government issued a whole new currency that had 10 times the value of the old currency. So if you used to make 10,000 foobars a year, now you make 1,000 new foobars. And likewise the price of everything you buy is divided by 10. If a certain model car used to cost 2,000 foobars, now it costs 200 new foobars. Are you better or worse off? Clearly if ALL prices change by the same percentage, then it makes absolutely no difference. (Aside from the hassle of making the switch and getting used to the new numbers.) A currency where 1 unit of money buys more is not necessarily a ""stronger currency"". Any more than inches are ""better"" than centimeters because you get more wood for an inch than you get for a centimeter. A currency is said to be ""strong"" when it's value is stable or increasing relative to other currencies. If yesterday I could trade 10 foobars for 1 plugh, but today I only need 9 foobars to buy 1 plugh, then foobars are stronger than plughs. Even though I still need more foobars than plughs to buy the same item."
It seems possible if the Euro is partially/entirely unwound that policies could be enacted to prohibit exactly this behavior, otherwise what will stop outflow to the stronger countries on a massive scale? (Thus amplifying the resulting decade-long clusterfuck)  We've never had this situation in Europe before, and already for Greece and Spain there are suggestions to instigate withdrawal controls. It doesn't seem far fetched to imagine retroactive controls placed on private deposits in newly-foreign-currency banks.  If I were concerned about the Euro's collapse I'd be more inclined to move assets out of the eurozone entirely Their biggest problem is that their main industry is shipping. Anything they could do to their currency wouldn't help the shipping industry at all. They can't even raise taxes, they aren't the only convenience flag in the world and ships are obviously very easy to move out.  The only industry they have that could get any benefit from a devaluation would be tourism, but that would be mostly negated by moving out of the euro. 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. I suppose they still could risk hyperinflation? Anyways, if they got their own currency that would probably be positive for their exports. Still, what are they going to export? Buying any raw materials would be super expensive with their devalued currency. What is your thought about their exporting with devalued currency? "I think you just don't understand what ""intrinsic"" means. It's not an opinion. It's a fact that currencies like the USD and EUR have no intrinsic value. That doesn't mean they're worthless, they just have no intrinsic value. Technically dollar COINS have intrinsic value, because they're a piece of metal that can be used for something else. Dollars itself however don't have intrinsic value." The dollar is the reserve currency of choice because the full faith and credit of the US is big, liquid, and stable compared to any currently-available alternative.   The Euro and Yuan are big enough to displace the dollar (and maybe the Yen), but any fears about the dollar being subject to fickle whims of politics and policy are significantly worse with those options. 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. "Then can you elaborate on what you meant by ""at the end of the day, fiat currencies are based on trust and accountability of the government""?  I would normally *agree* with that statement, but your use of it as a point of concern in your previous post appears to contradict what you just said." Yes, this phenomenon is well documented.  A collapse of an economy's exchange rate is coincidented with a collapse in its equities market.    The recent calamities in Turkey, etc during 2014 had similar results. Inflation is highly correlated to valuations, and a collapse of an exchange rate is highly inflationary, so a collapse of an exchange rate is highly correlated to a collapse in valuations. "The basic idea is that money's worth is dependent on what it can be used to buy. The principal driver of monetary exchange (using one type of currency to ""buy"" another) is that usually, transactions for goods or services in a particular country must be made using that country's official currency. So, if the U.S. has something very valuable (let's say iPhones) that people in other countries want to buy, they have to buy dollars and then use those dollars to buy the consumer electronics from sellers in the U.S. Each country has a ""basket"" of things they produce that another country will want, and a ""shopping list"" of things of value they want from that other country. The net difference in value between the basket and shopping list determines the relative demand for one currency over another; the dollar might gain value relative to the Euro (and thus a Euro will buy fewer dollars) because Europeans want iPhones more than Americans want BMWs, or conversely the Euro can gain strength against the dollar because Americans want BMWs more than Europeans want iPhones. The fact that iPhones are actually made in China kind of plays into it, kind of not; Apple pays the Chinese in Yuan to make them, then receives dollars from international buyers and ships the iPhones to them, making both the Yuan and the dollar more valuable than the Euro or other currencies. The total amount of a currency in circulation can also affect relative prices. Right now the American Fed is pumping billions of dollars a day into the U.S. economy. This means there's a lot of dollars floating around, so they're easy to get and thus demand for them decreases. It's more complex than that (for instance, the dollar is also used as the international standard for trade in oil; you want oil, you pay for it in dollars, increasing demand for dollars even when the United States doesn't actually put any oil on the market to sell), but basically think of different currencies as having value in and of themselves, and that value is affected by how much the market wants that currency." As mentioned in several other answers, the main reason for high rates is to maximize profit. However, here is another, smaller effect: The typical flow of getting money from an ATM: Suppose you have a minute to consider the offer, then in that time the currency may drop or rise (which you can see from an external source of information). Therefore this opens a window for abuse. For real major currencies these huge switches are rare, but they do happen. And when 1 or 2 minor currencies are involved these switches are more common. Just looking at a random pair for today (Botswana Pula to Haitian Gourde) I immediately spotted a moment where the exchange rate jumped by more than 2 %. This may not be the best example, but it shows why a large margin is desirable. Note that this argument only holds for when the customer knows in advance what the exchange rate would be, for cases where it is calculated afterwards I have not found any valid excuse for such large margins (except that it allows them to offer other services at a lower price because these transaction). 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) "It's likely that the main reason is the additional currency risk for non-USD investments. A wider diversification in general lowers risk, but that has to be balanced by the risk incurred when investing abroad.  This implies that the key factor isn't so much the country of residence,  but the currency of the listing. Euro funds can invest across the whole Euro zone. Things become more complex when you consider countries whose currency is less trusted and whose economy is less diversified. In those cases, the ""currency risk""  may be more due to the national currency, which justifies a more global investment strategy." I've always understood inflation to be linked to individual currencies, although my only research into the subject was an intro economics course in undergrad and I don't recall seeing why that would be the case.  I guess the basic principle is that currency traders are watching the printing presses and trading in exchange markets to the point that the exchange rates fall in relation to increases in money supply. There's probably something about the carry trade in there as well, but it's late and I took some medications, so someone else will have to carry that torch. I must admit I've not really paid attention to foreign currencies like HKD, but the proximity and political relationship with China probably greatly complicates your question, since part of the problem has been China's currency peg. What is essential is that company you are selling is transparent enough. Because it will provide additional liquidity to market. When I decide to sell, I drop all volume once at a time. Liquidation price will be somewhat worse then usual. But being out of position will save you nerves for future thinking where to step in again. Cold head is best you can afford in such scenario. In very large crashes, there could be large liquidity holes. But if you are on upper side of sigmoid, you will be profiting from selling before that holes appear. Problem is, nobody could predict if market is on upper-fall, mid-fall or down-fall at any time.