Course: AP®︎/College Macroeconomics > Unit 4Lesson 3: Definition, measurement, and functions of money
Functions of money
Money functions as a medium of exchange, allowing individuals to trade goods and services with one another. It also serves as a store of value, allowing people to save wealth over time. Lastly, it functions as a unit of value, enabling people to compare the worth of different items. Created by Grant Sanderson.
Want to join the conversation?
- Is money really a store of value, given long-term inflation or even hyperinflation? Wouldn't the unit of value have to retain its purchasing power over time?(4 votes)
- Not really. However, there are alternatives to money that can act as a store of value, like index funds. The most important function of money is as a unit of value, which requires only that everyone know what it is worth. A unit can change, as long as everyone knows what its value is at any given time.(6 votes)
- So what is the controversial fourth function of money?
Spoiler alert: it is a standard of deferred payment, the accepted means of settling debt (third video in the playlist).(3 votes)
- man, here i am studying for econ and then out of nowhere im graced by the wisdom of 3blue1brown.(3 votes)
- Can Bitcoin be considered as a money?(1 vote)
- In my opinion, at the moment, if you take into the consideration the three aspects presented in the video: no, it is not money.
1) It is not really an universal medium of exchange. It is accepted as a mean of payment, but only in very very few places. And definitely is not used in exchanges between everyday people.
2) It is not a store of value. Sometimes it goes up, sometimes it goes down. It went down from around 18k $ for one bitcoin in December 2017, to 6k $ right now (June 2018).
3) It is not a unit of value. Because it fluctuates so much, you cannot really use it to judge prices or measure value.
But what it really is? In my opinion, It is a speculative asset with no representation for real (physical) value, working on a principle of "greater fool" or "last person holding the bag".(3 votes)
- explain the effects of inflation on the functions of money(1 vote)
- [Voiceover] Hello, everyone, Grant here. So I'd like to talk to you today about the various functions of money. Functions of money. Now money, of course, is something that we all use every day and we kind of have a general feel for what it is, but it's interesting to step back and actually contemplate what is money. What gives it its value? What is it that we use it for? Why is it that you can use some things for money throughout history, you know, people have used not just gold and silver but things like salt or cigarettes as money, and why other things can't be used. And economists generally divide the functions of money, the things that it does for us into three different categories. And sometimes people add a fourth in there. I won't get to that in this video, I'll talk about it in a different one, but there's kind of three main ones that people usually talk about. So if you were an economist, just kind of philosophizing about what the functions of money are, you might start by thinking, well, what does the world look like without money? Like, for example, let's say that you were a lawyer and you provide legal counsel to people and this is the service that you provide and this is the way you add value to the economy, and let's say it's the case that you're refurnishing and you want a chair, you want to go out into the world and you want to buy a chair. Well, what that would require is that you find someone who happens to produce chairs. You find some person out there, and his way of adding value to society is to produce chairs, and this is what he does, and he's specialized at it and he's very good. Now the issue here, because money doesn't exist, you basically have to trade with him, you have to barter in some way. And this is what's called a barter economy. And in order to do that, given that you've specialized in law, is the thing that you provide and add value with, you kind of have to hope that he wants legal services. If he happens to be in a situation where he wants the thing that you provide, which in this case is legal services, and if that were true and you had that good fortune, then you would be able to trade some legal services over to him and he would trade you some number of chairs, and all would be well. But of course, this is kind of rare, especially given how specialized you are. And this idea where you want something and he wants something and those line up with each other actually has a name. This is called the double coincidence of wants. Double coincidence, and it's worth writing down because people kind of reference this when we're talking about barter economies of wants. And by barter economy I just mean you know, this kind of set-up, but scaled up to the scale of society where everybody's trading based on their specialty and what someone else needs. And in a world of money this seems absurd, because in reality what you do, is you would be over here, and sure you would provide your legal services, you'd kind of provide legal services to someone as your way of adding value, but it would be for just anyone who wants it, not based on what they produce, and in response, in exchange for that, they give you cash, they just give you money, something that you can then use, that everybody accepts for whatever it is that you want. So in this case, if you want chairs, then you bring it over to the guy who produces chairs and that's what he gives you, you know, a chair. And in so far as money serves this function, where it is kind of the universal thing to trade, it's called a medium of exchange, medium of exchange. And what that means is anytime that you want to exchange for something, this is the common thing of value that you use to actually trade with the world. But that's not the only thing money does. That's a really big part, that kind of allows the entire economy to exist, and it allows you to specialize in something like legal services. But what else does money do? What else would be harder to do in a world without money? Let's say you produce, as a lawyer, you know, producing legal services, a little bit more that you actually wanted to consume, and you're hoping to kind of save up some value, so that maybe later on you can buy a house, or you can pay for your kid's education or something like that. You want to actually start storing value and saving it up. Well, in this barter economy, you would have to find something, since money doesn't exist, you would have to find something of value and start storing that. Maybe, you know, chairs might hold their value so you're hoping to store them or maybe you have to buy land or something that you think will store it, but there's not kind of a good de facto medium that you can do it for. So in this sense, since that's something that we usually do with money, it's also called a good store of value. So this is considered kind of a second use of money, store of value, distinct from a medium of exchange, because the idea of needing something to trade with is pretty different from wanting to kind of save value. And for this third function, think back to this case where you're hoping to barter legal services for chairs. I mean, once you start getting into the specifics, you can start asking the question, well, actually, how many hours of legal services correspond to one chair? And if you want to buy something different, you're going grocery shopping, how many hours of legal services corresponds to buying one apple? And similarly the chair guy, he has to go off and every time he's gonna buy an apple, he has to think how many chairs correspond to an apple? And trying to relate values like this starts getting really complicated unless you just have some kind of actual unit to deal with, something that you can use to actually measure value of everything, like a yardstick for value. And of course in the real economy, we just give everything a dollar value, or a euro value, or a peso value, depending on where you are, but you give it a value that corresponds to the currency, to the money that you're dealing with. So people will say money serves as a unit of value, a unit of value, and basically that means that it gives you the starting number, it gives you the meaning of the number one so that you can say, well if this is worth one dollar, then what is worth three dollars? Or maybe an hour of this lawyer's time is worth a hundred dollars, and one of these chairs is worth $50, and you can start actually comparing the values of various different goods that way. And I actually think this is a pretty interesting one. This is the kind of thing that would be easy to underappreciate until you realize how important it is to have something like this. And in the next video or two I'm going to talk about a certain historical case of hyperinflation in Brazil where basically what happens is money loses some of these functions, and you can see just how much a society actually breaks down if what is supposed to be money stops serving these functions. So with that, I will see you next video.