Why certain currencies are considered safe havens in times of turmoil
It's a combination of neutrality, economic power, economic freedom, a history of stability, and tradition. In the case of the Japanese yen, it's obviously economic power that is the determining factor, as Japan is the world's third largest economy. Switzerland, on the other hand, is only the 19th largest economy, but ranks very high in all the other criteria. "Switzerland is presumably where one moves the money in case of an apocalypse; although, they have lost some of that appeal now with the tax reporting to the EU and USA. Switzerland has a very old, stable banking industry, but this isn't the only appeal.  Their reputation for safeguarding money, be it despot or Nazi, is most of the attraction.  Low to no taxes is the second.  Also, there isn't much financially illegal despite recent changes.  Put that all together, and if a country is about to go to hell in handbasket because it borrowed too much or goes to war while Switzerland stays stable and very strict about paying depositors, those residents are going to try to move as much money to Switzerland as possible before its confiscated for one reason or another, sending the CHF up. Japan is a different duck.   They have persistently ~0% inflation thus low nominal and real interest rates.  With them, the so-called ""cash & carry trade"" or more ubiquitous ""carry trade"" dominates.  Many investors choose to borrow in JPY to buy investments denominated in other currencies.  If the countries of those other currencies are about to take their residents' money or go to war, putting money at jeopardy, the residents doing the carry trading will try to unwind their levered investments to reduce risk, sending the JPY up."
There's no way the greek government has the cash to defend a peg. Defending a peg takes a lot of cash. If your currency goes above the peg, you need to print more. If it goes below the peg, you need to buy it back, with euros for example. Greece has no euros, and so cannot defend a peg. "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." Dollar is the lingua franca of the financial industry and unluckily it is the US currency. It is till today considered the most safest investment bet, that is why you have China possesing $3 trillion of US debt, as an investment albiet a very safe one. Financial investors get in queue to by US bonds the moment they are put up for sale. Because of the AAA rating the investors consider it to be safe at a specific rate. Now when you lower the credit rating you are indirectly asking the US government that you want a higher return(yield) on your investments. When you ask for higher yields, it translates into higher interest rates (money US would get for bonds issued decreases and so more bonds are issued). So you basically start looking at a slowdown in consumer spendings households and businesses. With already defaults, repossesions and lesser spending, the slowdown would increase manifold. Currencies don't have intrinsic value. Just because you have to pay taxes in USD does not mean it has intrinsic value. The government could theoretically switch currency every second, not that that will ever happen.  But yes the USD is supported by the US government and that's like a safety net for the value of the USD. Bitcoin doesn't have a government accepting bitcoin in taxes (except maybe liberland or something) so BTC doesn't have that safenet. But with such a liquid market and millions of buyorders bitcoin doesn't really need a safenet. There will always be demand. I prefer a scarce currency with growing demand than an inflationary currency backed by a corrupt government that loses value over time. If you want to use that money and maybe don't have the time to wait a few years if things should go bad, than you will definitely want to hold a good bunch of your money in the currency you buy most stuff with (so in most cases the currency of the country you live in) even if it is more volatile. Here's a point in favor of central banks: With a central bank in the middle making sure payments clear, transactions can happen with near perfect trust. When a bank has a daylight overdraft, the Fed covers it. When a bank needs overnight funding, the Fed provides it. If a bank needs vault cash, a truck shows up from the Fed.  Without this, no one could ever be entirely confident the other party was money-good. With a volume of transactions that can amount to annual GDP in as little as six days, this level of trust is critical to a smoothly functioning system of payments. Precious metals also tend to do well during times of panic. You could invest in gold miners, a gold or silver ETF or in physical bullion itself. But then why wouldn't that be their primary mode to control their currency now/are they starting/hinting at doing so to move away from US treasuries? There must be benefits to Treasury purchasing that seems better to them, maybe that QE can't do alone?  And I have to imagine with the tenuous nature of their financial system, the shock alone from losing access to the Dollar (and before they could use QE to devalue the currency back down) would be a major issue. Because people trade currency in exchange for goods and services. They can easily prevent competition by violent means or by having control of the market through market share. Price can be controlled by the threat of super low prices in order to drive out competing businesses. I think your approach of looking exclusively at USD deposits is a prudent one. Here are my responses to your questions. 1) It is highly unlikely that a USD deposit abroad be converted to local currency upon withdrawal. The reason for offering a deposit in a particular currency in the first place is that the bank wants to attract funds in this currency. 2) Interest rate is a function of various risks mostly supply and demand, central bank policy, perceived risk etc. In recent years low-interest rate policy as led by U.S., European and Japanese central banks has led particularly low yields in certain countries disregarding their level of risk, which can vary substantially (thus e.g. Eastern Europe has very low yields at the moment in spite of its perceived higher risk). Some countries offer depository insurance.  3) I would focus on banks which are among the largest in the country and boast good corporate governance i.e. their ownership is clean and transparent and they are true to their business purpose. Thus, ownership is key, then come financials. Country depository insurance, low external threat (low war risk) is also important. Most banks require a personal visit in order to open the account, thus I wouldn't split much further than 2-3 banks, assuming these are good quality. Public debt and risk of currency devaluation are two very, very different things.  Until the BRICS are able to buy commodities on a significant scale using a market basket of their own currencies, the USD will remain one of the (if not the) safest currencies in the world. 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). I meant bitcoin. The issuer is the designer of the currency, which I have stated multiple times, has structural issues. The exchanges are the banks, which have been shown to be susceptible to hacking. Bitcoin is also a fiat currency, just like every other currency, just one with no faith or guarantees behind it and no one to hold accountable when things go sideways. No thanks. "Money is money because people believe it is money. By ""believe it is money"", I mean that they expect they will be able to turn it into useful goods or services (food, rent, houses, truckloads full of iron ore, mining equipment, massages at the spa, helicopter rides, iPads, greenhouses, income streams to support your future retirement, etc). Foreign exchange rates change because people's ideas about how much useful goods or services they can get with various currencies change. For example: if the Zimbabwe government suddenly printed 10 times as much money as used to exist, you probably couldn't use that money to buy as much food at the Zimbabwe-Mart, so you wouldn't be willing to give people as many US-dollars (which can buy food at the US-Mart) for a Zimbabwe-dollar as you used to be able to. (It's not exactly that easy, because - for instance - food in the US is more useful to me than food in Zimbabwe. But people still move around all sorts of things, like oil, or agricultural products, or minerals, or electronics components.) The two main things that affect the value of a currency are the size of the economy that it's tied to (how much stuff there is to get), and how much of the currency there is / how fast it's moving around the economy (which tells you how much money there is to get it with). So most exchange rate shifts reflect a change in people's expectations for a regional economy, or the size of a money supply. (Also, Zimbabwe is doing much better now that it's ditched their own currency - they kept printing trillions of dollars' worth - and just trade in US dollars. Their economy still needs some work, but... better.)" "My advice would be to invest that 50k in 25% batches across 4 different money markets. Batch 1: Lend using a peer-to-peer account - 12.5k The interest rates offered by banks aren't that appealing to investors anymore, at least in the UK. Peer to peer lending brokers such as ZOPA provide 5% to 6%  annual returns if you're willing to hold on to your investment for a couple of years. Despite your pre-conceptions, these investments are relatively safe (although not guaranteed - I must stress this). Zopa state on their website that they haven't lost any money provided from their investors since the company's inception 10 years ago, and have a Safeguard trust that will be used to pay out investors if a large number of borrowers defaulted. I'm not sure if this service is available in Australia but aim for an interest rate of 5-6% with a trusted peer-to-peer lender that has a strong track record. Batch 2: The stock market - 12.5k An obvious choice. This is by far the most exciting way to grow your money. The next question arising from this will likely be ""how do I pick stocks?"". This 12.5k needs to be further divided into 5 or so different stocks. My strategy for picking stock at the current time will be to have 20% of your holdings in blue-chip companies with a strong track record of performance, and ideally, a dividend that is paid bi-anually/quarterly. Another type of stock that you should invest in should be companies that are relatively newly listed on the stock market, but have monopolistic qualities - that is - that they are the biggest, best, and only provider of their new and unique service. Examples of this would be Tesla, Worldpay, and Just-eat. Moreover, I'd advise another type of stock you should purchase be a 'sin stock' to hedge against bad economic times (if they arise). A sin stock is one associated with sin, i.e. cigarette manufacturers, alcohol suppliers, providers of gambling products. These often perform good while the economy is doing well, but even better when the economy experiences a 2007-2008, and 2001-dotcom type of meltdown. Finally, another category I'd advise would be large-cap energy provider companies such as Exxon Mobil, BP, Duke Energy - primarily because these are currently cheaper than they were a few months ago - and the demand for energy is likely to grow with the population (which is definitely growing rapidly). Batch 3: Funds - 12.5k Having some of your money in Funds is really a no-brainer. A managed fund is traditionally a collection of stocks that have been selected within a particular market. At this time, I'd advise at least 20% of the 12.5k in Emerging market funds (as the prices are ridiculously low having fallen about 60% - unless China/Brazil/India just self destruct or get nuked they will slowly grow again within the next 5 years - I imagine quite high returns can be had in this type of funds). The rest of your funds should be high dividend payers - but I'll let you do your own research. Batch 4: Property - 12.5k The property market is too good to not get into, but let's be honest you're not going to be able to buy a flat/house/apartment for 12.5k. The idea therefore would be to find a crowd-funding platform that allows you to own a part of a property (alongside other owners). The UK has platforms such as Property Partner that are great for this and I'm sure Australia also has some such platforms. Invest in the capital city in areas as close to the city's center as possible, as that's unlikely to change - barring some kind of economic collapse or an asteroid strike. I think the above methods of investing provide the following: 1) Diversified portfolio of investments 2) Hedging against difficult economic times should they occur And the only way you'll lose out with diversification such as this is if the whole economic system collapses or all-out nuclear war (although I think your investments will be the least of your worries in a nuclear war). Anyway, this is the method of investing I've chosen for myself and you can see my reasoning above. Feel free to ask me if you have any questions."