If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content
Current time:0:00Total duration:6:10
MEA‑3 (EU)
MEA‑3.C (LO)
MEA‑3.C.1 (EK)
MEA‑3.C.2 (EK)

Video transcript

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 will 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 you know you provide legal counsel to people and this is the service that you provide and this is the way that you add value to the economy and let's say it's the case that you your refurnishing and you want a chair right you want to go out to 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 has 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 laws the thing that you provide and add value with you kind of have to hope that he wants legal services that 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 was true if 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 this feels kind of rare especially given how specialized you are and this idea where you want something and he wants something and does 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 want and buy barter economy I just mean you know this kind of setup but scaled up to the scale of society where everybody's trading based on their specialty and what someone else needs and of course 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 would kind of provide legal services to someone as your way of adding value but it would be to just anyone who wants it not not based on what they produce and in response in exchange for that they give you cash they just give you you know money something you can then use that everybody accepts for whatever it is that you want so in this case you know if you want a chair then you bring it over to the guy who produces chairs and that's what he gives you you know a chair and insofar as money serves this function where it is kind of the universal thing to trade it's called a medium medium of exchange 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 produced as a lawyer you know producing legal services a little bit more than you actually want it 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 you know pay for your kids 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 medium of exchange because the idea of needing something to trade is pretty different from wanting to kind of save value and for this third function a 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 right like how many hours of legal services corresponds to one chair and if you want to buy something different you know 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 going to buy an apple he has to think how many chairs correspond to an apple and trying to relate values like this so it's 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 at a dollar value or a URL 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 that 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 $1 then what is worth $3 or maybe an hour of this lawyers time is worth $100 in one of these chairs is worth $50 and you can start actually comparing the values of various different goods that way and actually think this is this is a pretty interesting one this is the kind of thing that would be easy to under appreciated 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