What is the lifespan of a series of currency?
In general, currency has no expiration date. Specifically, in Canada, the Bank of Canada has been issuing banknotes since 1935, and these are still considered legal tender, even though they don't look much like the modern banknotes.  Before that, Canadian chartered banks issued currency, and these also still have value. However, there are a few things to note.  First of all, with currency of that age, it often has more value as a collector's item than the face value.  So spending it at a store would be foolish. Second, store clerks are not experts in old currency, and will not accept a bill that they do not recognize.  If you want the face value of your old currency, you may need to exchange it for modern currency at a bank. Having said all that, there are certainly cases where currency does expire.  Generally this happens when a country changes currency.  For example, when the Euro was introduced, the old currencies were discontinued.  After a window of exchange, the old currency in many cases lost its value.  So if you have some old French Franc notes, for example, they can no longer be exchanged for Euros. These types of events cannot be predicted in the future, of course, so it is impossible to say when, if ever, the Canadian currency you have today will lose its spending value in Canada. 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. "Currency lives no more then 50 years. US currency did not expire in last 100 years, but it was reinstated few times, last one was 2009. Note that currency is not just what you hold in your hand. Currency is system of relations of money supply (currency is not money but we forced to use standard terminology), banking rules and government policy. Currency exists as long as government wants it to. In 2009 for example, US government decided it needs new currency and just printed whole new money supply. So US dollar is now counting as ""partially fresh new currency"". It was reinstated. Not expired. But today's dollar is totally different from 90s and 00s. Will it be accepted after 200 years? Yes (probably). But most likely at that time there will be totally new US dollars. And new Euros, new Pounds and so on. Currency is method of transfer. You can have that physical coins you have, but as economic agent it will die very quickly. It is not only related to inflation, in fact, inflation is the least of your worries. If you count all currencies in the world which ever existed, most of them 99.99% are completely dead by now (with governments which supported it). Not even single one currency which lived more then 100 years. US dollar was reinstated in 1860, 1907, 1930, 1973, 1987, 2009 and  in fact it is not single currency but dozen which were allowed to be used ""for compatibility reasons""."
"Since you want to know exactly what ""yield"" means, let's get all the details of the security down first. Treasury Bills are 0-1 year and do not pay interest/coupons. The yield comes from buying the T-Bill at a discount. For example, you buy a T-Bill for $99 and it pays $100 when it matures, and the yield over that holding period is 1/99. When people talk about ""yield"" they are generally talking about annualized yield unless stated otherwise.  Treasury Notes are 2-10 years. They pay interest semi-annually. Treasury Bonds are 20-30 years and they also pay interest semi-annually. Again, ""yield"" is typically the annualized yield, or the two semi-annual interest payments added together (without compounding). These have interest payments so they are typically sold at par. They may trade a premium/discount afterwards.  TIPS pay a constant coupon rate, but the principal is adjusted up and down with inflation." I'd have anything you would need for maybe 3-6 months stored up: food, fuel, toiletries, other incidentals.  What might replace the currency after the Euro collapses will be the least of your concerns when it does collapse. Echoing JohnF, and assuming you mean the physical, rather than abstract meaning of money?  The abstract concept obviously isn't replaced (unless the currency is discredited, or like the creation of the Euro which saw local currencies abandoned). The actual bits of paper are regularly collected, shredded (into itty-bitty-bits) and destroyed.  Coinage tends to last a lot longer, but it also collected and melted down eventually. Depends on the country, though.  No doubt, many people who took a gap year to go travelling in points diverse came across countries where the money is a sort of brown-grey smudge you hold with care in thick wadges. The more modern economies replace paper money on a dedicated cycle (around three years according to Wikipedia, anyway). If you're willing to use OFX or QIF files, most Canadian banks can spit output more data than 90 days. The files are typically used to import into Quicken-like local programs, but can be easily parsed for your webapp, I imagine. As the value of a currency declines, commodities, priced in that currency, will rise. The two best commodities to see a change in would be oil and gold. Money itself has no value. A gold bar is worth (fuzzy rushed math, could be totally wrong on this example figure) $423,768.67. So, a 1000 dollars, while worthless paper, are a token saying that you own %.2 of a gold bar in the federal reserve. If a billion dollars are printed, but no new gold is added to the treasury, then your dollar will devalue, and youll only have %.1 percent of that gold bar (again, made up math to describe a hypothetical). When dollars are introduced into the economy, but gold has not been introduced to back it up, things like the government just printing dollars or banks inventing money out of debt (see the housing bubble), then the dollar tokens devalue further. TL;DR: Inflation is the ratio of actual wealth in the Treasury to the amount of currency tokens the treasury has printed. Coins have the minimum value of the metal they are made from.   Bank notes (paper money) would only be valuable when it becomes rare.  And there isn't a good way to predict how quickly something like Zimbabwe dollars will become rare (that I know of at least). I'm not sure, but I think the monetary system of Second Life or World of Warcraft would correspond to what you are looking for. I don't think they are independent of the dollar though, since acquiring liquidity in those games can be done through exchange for real dollars. But there can be more closed systems, maybe Sim type games where this is not the case. I hope this helps. Currencies today are mostly just paper with perceived value.   Gold and silver aren’t the same as modern monies because there is an actual finite amount in the world.   Paper money is technically infinite and can be used to control the value of it to that end such as quantitative easing.   The question is is Bitcoin like paper currency? In which case things that affect paper money would effect it with some exceptions.   Or is it like gold and silver in that there is a finite amount?   That’s for people who know more about it than me but I have heard terms like mining bitcoin and stuff...  I was thinking about investing in bitcoins too. 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. It depends on what actions the European Central Bank (ECB) takes.  If it prints Euros to bail out the country then your Euros will decline in value.  Same thing with a US state going bankrupt.  If the FED prints dollars to bailout a state it will set a precedent that other states can spend carelessly and the FED will be there to bail them out by printing money. If you own bonds issued by the bankrupting state then you could lose some of your money if the country is not bailed out. "Currencies that are pegged or fixed require that foreign currencies are held by the central issuer at a proportional amount. This is analogous to having a portfolio of currencies that the central bank issues shares from - in the form of its own currency. We will continue with this analogy, if the central bank says these ""shares"" are worth $1, but the underlying components of the portfolio are worth $0.80 and decreasing, then it is expensive for the central bank to maintain its peg, and eventually they will have to disregard the peg as people start questioning the central bank's solvency. (People will know the $1 they hold is not really worth what the central bank says it is, because of the price changes people experience in buying goods and services, especially when it comes to imports. Shadow economies will also trade using a currency more reflective of labor, which happens no matter what the government's punishments are for doing so). Swiss National Bank (central bank) did this in early 2015, as it experienced volatility in the Euro which it had previously been trying to keep it's currency pegged to. It became too expensive for it to keep this peg on its own. The central bank can devalue its currency by adjusting the proportions of the reserve, such as selling a lot of foreign currency X, buying more of currency Y. They can and do take losses doing this. (Swiss National Bank is maintaining a large loss) They can also flood their economy with more of their currency, diluting the value of each individual 1 dollar equivalent. This is done by issuing bonds or monetizing goods and services from the private sector in exchange for bonds. People colloquially call this ""printing money"" but it is a misnomer in this day and age where printers are not relevant tools. The good and service goes onto the central bank's balance book, and the company/entity that provided the service now has a bond on its book which can be immediately sold to someone else for cash (another reading is that the bond is as good as cash). The bond didn't previously exist until the central bank said it did, and central banks can infinitely exchange goods and services for bonds. Bond monetization (also called Quantitative Easing) is practiced by the Federal Reserve in the United States, Bank of Japan, European Central Bank and now the Central Bank of the Republic of China" Granted, currencies don't have intrinsic value.   Cryptocurrency is worse than government currencies in a few ways:   - it costs real resources to produce   - no institution keeps values stable   - values are volatile in practice  In those respects, crypto is more similar to a precious metal than a currency. Except it's worse than precious metals too, as metals have some intrinsic value.  Crypto won't be able to overcome these disadvantages to compete with government-issued currencies in the long term. It might compete with gold long term. There are a lot of nuts and gold bugs in the world, and crypto might live on in that fringe space. This was such a wonderful and clear explanation. It has helped me to understand (at 28) a concept that I have always been a bit murky on. I would feel safe making the bet that you are a teacher of some sort. I would find it extremely interesting to hear you thoughts on why we don't use the gold standard anymore. Do you work in finance? "First off learn from this:  Never cosign again.  There are plenty of other ""tales of woe"" outlined on this site that started and ended similarly. Secondly do what you can to get off of the loan.  First I'd go back to her dad and offer him $1000 to take you off the loan and sign over the car.  Maybe go up to $3000 if you have that much cash.  If that doesn't work go to the bank and offer them half of the loan balance to take you off.  You can sign a personal loan for that amount (maybe).  Whatever it takes to get off the loan.  If she has a new BF offer him the same deal as the dad. Why do you have to do this?  Because you owned an asset that was once valued at 13K and is valued at (probably) less than 4K.  Given that you have a loan on it the leverage works against you causing you to lose more money.  The goal now is to cut your losses and learn from your mistakes.     I feel like the goal of your post was to make your ex-gf look bad.  It's more important to do some self examination.  If she was such a bad person why did you date her?  Why did you enter a business transaction with her?  I'd recommend seeking counseling on why you make such poor choices and to help you avoid them in the future. Along these lines I'd also examine your goals in life.  If your desire is to be a wealthy person, then why would you borrow money to buy a car?  Seek to imitate rich people to become rich.  Picking the right friends and mates is an important part of this.   If you do not have a desire to be a wealthy person what does it matter?  Losing 13K over seven months is a small step in the ""right"" direction."