Why do I not see goods and services all change their price when inflation is high?
In most circumstances prices do not change on a daily basis on most goods and services, and just because inflation is high does not mean all prices of every good and service has to increase over the short term.  Prices are determined by costs of doing business, manufacturing costs and wage growth, and by competition.  For example, if one product has very little competition and costs to produce it have gone up, then the seller might increase prices by 10% to cover their cost of buying the goods off the manufacturer, whilst another product may have plenty of competition, the seller has sourced a new manufacturer from overseas with lower manufacturing costs, they might lower their selling costs by 5% to better compete and increase their sales. Inflation figures are calculated from a set basket of goods and services, and if inflation increases it does not mean that all prices in that basket have gone up, only that the aggregate for the whole basket of goods and services has gone up since the last inflation figures were calculated. How high is high? In countries that suffered hyperinflation such as the Weimar Republic around 1923 and Zimbabwe around the late 1990s this certainly did happen on a daily basis. E.g. One boy, who was sent to buy two bread buns, stopped to play football and by the time he got to the shop, the price had gone up, so he could only afford to buy one. or One father set out for Berlin to buy a pair of shoes. When he got there, he could only afford a cup of coffee and the bus fare home. or At the height of the country's economic crisis that year, prices were rising at least twice day, with Zimbabweans forced to carry cash around in plastic bags just to buy basic items. It can take a while for inflation to seep into all aspects an economy and be felt by a consumer. Often, things that consumers use the most (like gasoline, wheat products, corn products, soy products, and sugar), are commodities spread across global markets with their own pricing which may be impacted by inflation in any given country.  Also, inflation can be beneficial in some ways. A $500/month mortgage payment was a big deal 30 years ago, and now would be considered trivial. That's entirely because of inflation.  Run-away inflation, where people are burning the currency to stay warm, is a different beast altogether. Be wary of people who conflate inflation, consumer pricing, and destructive currency devaluation, because they're not the same things.
I guess other than tradition and inflation, probably because the merchants want them.   In the US, what currently costs $2.00 used to cost $0.10.   So 75 years ago, those individual cents made a pretty bid difference.  Inflation causes prices to go up, but doesn't get us to just change our currencies patterns. In your example, you are assuming that in an average day, the rounding errors you are willing to accept happen a couple of times.  2 or 3 cents here and there mean nothing to you.  However to the merchant, doing hundreds or thousands of transactions per day, those few cents up and down mean quite a bit in terms of profit. To an individual, looking at a time frame more than a single day (because who only participates in economies for a single day) there are potentially millions of transactions in a lifetime, mean potentially giving away millions of dollars because they didn't want to wait. And as for the comment that people working each 3 cents every 10 seconds, I would assume at least some of the time when they are waiting for rounding errors, they are not at work getting paid.  That concept is assuming that somebody is always willing to pay them for their time regardless of where that person is in the world; I have no facts and wild assumptions, but surely that can't be true for even a majority of workers. Finally, you should be happy if you happy to have an income high enough that you don't care about individual cents.  But there are those business people who see opportunity in folks like you and profit greatly from it.  I personally worry very much about who has my money; gov't gets paid to the penny and I expect returns to the penny.  A super polite service employee who smiled a lot serving me a beer is getting all the rounding errors I have. Doesn't work as it would be inflationary.  Businesses would raise prices knowing they could get more revenue. This cycles throughout the supply chains which in turn cause prices of other products to increase etc.  And why on earth you wouldn't means test something like this beyond me. When I ran a gas station, our price was largely set by our neighbors-- the other gas stations in the area. We couldn't go below the current cost of replacement gas, but other than that we wanted to be at .05 over the average. (We got away with charging more because we were the last station on a major road.) Everybody else did the same thing. Also, we only set prices once a day, early in the morning before the commuter rush. Changing prices while somebody is pumping gas Was Not Done, for fairly obvious reasons. So, you'd get these ripples of price-changing, as one station changed its price, and then all its neighbors would react to that the next day, and then THEIR neighbors would change the day after that, and so on. "One key to trading is recognizing expectations.  What you see in the market is not always a reflection of fundamentals; sometimes, it's a reflection of what people expect to occur, whether that actually happens or not, is debatable. When a currency experiences inflation, such as the CPI being higher today for the USD, it may see an increase because people expect that the central bank will raise rates.  Again, this may not be the case, and the traders with this expectation could be wrong.  If you're seeing a currency rise after reported inflation, more than likely, traders expect the inflation to benefit the currency in the longer run. Finally on the economics' side, and economists here can debate this, at least in the past the view was that there was a relationship between inflation and unemployment (see the Phillip's Curve).  This idea, depending on who you ask, was refuted in the 70s when we had both high inflation and high unemployment (stagflation).  Supposedly, if we have high unemployment, we should have low inflation, so we can always raise inflation to have low unemployment.  Note that you will still find some economists who think the Phillip's Curve is true, so ""refuted"" depends on who you ask. From what I've read, Austrian economists are the only economists who see inflation as always bad (long story short, I think it's Paul Cwik who argues that deflation is actually good); like you're seeing, other economists might see it as a good sign and it's only a concern when it's very high (hyperinflation)." Hmm... I don't understand how big of an impact that would have in the long run. In the short-run, I can see it being an issue due to price-inflation.   But long-term, wouldn't the market adjust accordingly? If the prices are raised beyond the individual households' disposable income, people will simply find alternative products.   I guess it would be a terrible thing if they controlled something that is necessary to us. But if that happens, I imagine a revolution will start.   What incentives do the large companies have in doing this? Yes traders, living or algorithmic, are the only direct factors that can cause a change in the price of a marketable item. Traders can be affected by news, broken exchanges ;), emotional cycles, lunar cycles, time the trader goes to lunch (or a power cycle if you are an algo running on that unfortunate OS), anything. There are two things you need to keep in mind when you look at Inflation as an entity. Inflation is necessary to keep in check the value of goods. As per Moore's Law for example, a mobile phone that you buy for £100 today will be available for £50 in two years. With increased purchasing power, one needs to maintain balance between the purchasing power and its value. If you think about the 'loss' at a rate of 2% you would have £96.04 (in terms of today's value) in two years. But if you looked at the same cell phone as leverage for your business where it allowed you to do work and earn £1000 in two years - the investment would clearly offset the cost of inflation. Inflation is incentive for people to spend their money. If you for example spent all of your £100 today, it is £100 income for someone else. He has further incentive to spend it creating a chain of transactions. In theory while this is a true mathematical loss, the increasing purchasing power helps you leverage your financial asset to get a return on your investment. I've seen a lot of long and complicated answers here so here is my simple and short answer: Let's say the economy consists of: 10 apples and 10$. Then an apple costs 1$. If you print 10$ more you have: 10 apples and 20$. Then an apple costs 2$. That is it! It's not what Kenshin said:  Over time, prices go up! However I would like to add something more on the topic: inflation is theft! If I hack the bank and steal 10% from each account it's obvious that it is theft. It's a bit less obvious when the government prints out money and people loose 10% of the value in their bank accounts but the end result is the same. Final note: some may disagree but I do not consider inflation when 5 of the apples rot and you have: 5 apples and 10$ and an apple now costs 2$. This is a drop in supply and if the demand stays the same prices will rise. "First, a clarification. No assets are immune to inflation, apart from inflation-indexed securities like TIPS or inflation-indexed gilts (well, if held to maturity, these are at least close). Inflation causes a decline in the future purchasing power of a given dollar1 amount, and it certainly doesn't just affect government bonds, either. Regardless of whether you hold equity, bonds, derivatives, etc., the real value of those assets is declining because of inflation, all else being equal. For example, if I invest $100 in an asset that pays a 10% rate of return over the next year, and I sell my entire position at the end of the year, I have $110 in nominal terms. Inflation affects the real value of this asset regardless of its asset class because those $110 aren't worth as much in a year as they are today, assuming inflation is positive. An easy way to incorporate inflation into your calculations of rate of return is to simply subtract the rate of inflation from your rate of return. Using the previous example with inflation of 3%, you could estimate that although the nominal value of your investment at the end of one year is $110, the real value is $100*(1 + 10% - 3%) = $107. In other words, you only gained $7 of purchasing power, even though you gained $10 in nominal terms. This back-of-the-envelope calculation works for securities that don't pay fixed returns as well. Consider an example retirement portfolio. Say I make a one-time investment of $50,000 today in a portfolio that pays, on average, 8% annually. I plan to retire in 30 years, without making any further contributions (yes, this is an over-simplified example). I calculate that my portfolio will have a value of 50000 * (1 + 0.08)^30, or $503,132. That looks like a nice amount, but how much is it really worth? I don't care how many dollars I have; I care about what I can buy with those dollars.  If I use the same rough estimate of the effect of inflation and use a 8% - 3% = 5% rate of return instead, I get an estimate of what I'll have at retirement, in today's dollars. That allows me to make an easy comparison to my current standard of living, and see if my portfolio is up to scratch. Repeating the calculation with 5% instead of 8% yields 50000 * (1 + 0.05)^30, or $21,6097. As you can see, the amount is significantly different. If I'm accustomed to living off $50,000 a year now, my calculation that doesn't take inflation into account tells me that I'll have over 10 years of living expenses at retirement. The new calculation tells me I'll only have a little over 4 years. Now that I've clarified the basics of inflation, I'll respond to the rest of the answer.  I want to know if I need to be making sure my investments span multiple currencies to protect against a single country's currency failing. As others have pointed out, currency doesn't inflate; prices denominated in that currency inflate. Also, a currency failing is significantly different from a prices denominated in a currency inflating. If you're worried about prices inflating and decreasing the purchasing power of your dollars (which usually occurs in modern economies) then it's a good idea to look for investments and asset allocations that, over time, have outpaced the rate of inflation and that even with the effects of inflation, still give you a high enough rate of return to meet your investment goals in real, inflation-adjusted terms. If you have legitimate reason to worry about your currency failing, perhaps because your country doesn't maintain stable monetary or fiscal policies, there are a few things you can do. First, define what you mean by ""failing."" Do you mean ceasing to exist, or simply falling in unit purchasing power because of inflation? If it's the latter, see the previous paragraph. If the former, investing in other currencies abroad may be a good idea. Questions about currencies actually failing are quite general, however, and (in my opinion) require significant economic analysis before deciding on a course of action/hedging. I would ask the same question about my home's value against an inflated currency as well. Would it keep the same real value. Your home may or may not keep the same real value over time. In some time periods, average home prices have risen at rates significantly higher than the rate of inflation, in which case on paper, their real value has increased. However, if you need to make substantial investments in your home to keep its price rising at the same rate as inflation, you may actually be losing money because your total investment is higher than what you paid for the house initially. Of course, if you own your home and don't have plans to move, you may not be concerned if its value isn't keeping up with inflation at all times. You're deriving additional satisfaction/utility from it, mainly because it's a place for you to live, and you spend money maintaining it in order to maintain your physical standard of living, not just its price at some future sale date. 1) I use dollars as an example. This applies to all currencies." Yes, in 2 ways: As you mention, the price of a home generally grows with inflation - along with other factors (supply and demand in local markets, etc.). Through financing. If you finance 80% of your purchase today, in 2014 dollars, you will pay back in future dollars. Those future dollars are worth less, because of inflation. Depending on what currency the price is quoted in and is originally sold, currency fluctuation can also carry over onto the price in your currency. An example for that would be bitcoin prices which sometimes show heavy ups and downs in one currency, but seem totally stable in another and can be tracked back to changed exchange rates between currencies. Also like others have said, prices on stocks are not actually fixed. You can offer to buy or sell at any price. Only if 2 people want to buy or sell for the same price there will actually be a transaction. The general discussion of inflation centers on money as a medium of exchange and a store of value. It is impossible to discuss inflation without considering time, since it is a comparison between the balance between money and goods at two points in time. The whole point of using money, rather than bartering goods, is to have a medium of exchange. Having money, you are interested in the buying power of the money in general more than the relative price of a specific commodity. If some supply distortion causes a shortage of tobacco, or gasoline, or rental properties, the price of each will go up. However, if the amount of circulating money is doubled, the price of everything will be bid up because there is more money chasing the same amount of wealth. The persons who get to introduce the additional circulating money will win at the expense of those who already hold cash. Most of the public measures that are used to describe the economy are highly suspect. For example, during the 90s, the federal government ceased using a constant market basket when computing CPI, allowing substitutions. With this, it was no longer possible to make consistent comparisons over time. The so-called Core CPI is even worse, as it excludes food and energy, which is fine provided you don't eat anything or use any energy. Therefore, when discussing CPI, it is important to understand what exactly is being measured and how. Most published statistics understate inflation. Inflation is being hidden in false government figures. They report inflation as 2% to 3%, but when look at my records for the last 5 years I see most of the things I am paying for are around 23% higher. It may even be higher as some things are hard to figure in. For example, many food items are being sold in smaller quantities for the same prices they sold for in larger packages. When was the last time you saw a 3 pound can of coffee in your local market, or a half gallon of ice cream?  Things like cable have gone up 50%. All my insurance policies are about 50% higher too. Meanwhile people's wages have gone up the 3% the government insists matching inflation. Hot dogs - counts as part of the food basket. Hardly one-off.   Cars - maybe could be included. On average, people buy cars every 5 years, so 12 cars for an 80 year old.   Gas - that one could well be warranted, the problem is the high volatility and the fact that fluctuations are not due to inflation, but rather commodity price fluctuations.   All the other stuff (phones, tv’s, Appliances, etc) is stuff that needs to be replaced several times throughout a persons life, so not one-off purchases.   House prices can and should address d through other mechanisms that have nothing to do with inflation. Either through better planning codes or macro prudential measures, but certainly not through manipulating interest rates. "Everyone buys different kinds of goods. For example I don't smoke tobacco so I'm not affected by increased tobacco prices. I also don't have a car so I'm not affected by the reduced oil prices either. But my landlord increased the monthly fee of the apartment so my cost of living per month suddenly increased more than 10% relative to the same month a year before.  This is well known, also by the statistical offices. As you say, the niveau of the rent is not only time- but also location specific, so there are separate rent indices (German: Mietspiegel). But also for the general consumer price indices at least in my country (Germany) statistics are kept for different categories of things as well.  So, the German Federal Statistical Office (Statistisches Bundesamt) not only publishes ""the"" consumer price index for the standard consumer basket, but also consumer price indices  for oil, gas, rents, food, public transport, ... Nowadays, they even have a web site where you can put in your personal weighting for these topics and look at ""your"" inflation:  https://www.destatis.de/DE/Service/InteraktiveAnwendungen/InflationsrechnerSVG.svg Maybe something similar is available for your country?"