UPDATED on 4/24/21
Bitcoin is not money. There are three main functions of money: 1) a unit of account (a measurement of value); 2) a medium of exchange; and 3) a store of value. The most important and unique function of money is to serve as a unit of account and because bitcoin is not a unit of account, bitcoin is not money.
If bitcoin is not money, what is it? Bitcoin is mainly a store of value like stocks, bonds, rare baseball cards, and lottery tickets. None of these are money because they do not serve the first two functions of money. Bitcoin is closer to a form of money than stocks because bitcoin is also occasionally used as a medium of exchange, and this is where bitcoin is unique. All other mediums of exchange are also used as primary units of account, but bitcoin, uniquely, is occasionally used as a medium of exchange that is never used as a unit of account. Every bitcoin transaction uses prices not in bitcoin, but in dollars (or another money). Bitcoin’s failure at the primary function of money is why bitcoin is not money and no economy could operate on bitcoin alone. Capitalism needs money to function and the most fundamental function of money is to serve as a unit of account.
Only the first two functions are really unique to money. Lots and lots of things serve as a store of value and money is one of the worst stores of value, so although this is a function of money, it is a distant third-place function. There is an inherent tension between the store-of-value function and the medium-of-exchange function because you can’t store your money and exchange it too just like you cannot have your cake and eat it too. Anything that is a good a store of value stops being used as a medium of exchange if there are any alternatives for exchange. That is the point of Gresham’s Law which says that whenever there is a choice between different currencies, everyone will hoard the one that is a better store of value and only the worst store of value will circulate as money. If everyone thought that the value of bitcoin was going to steadily and slowly drop whereas the value of the dollar was going to start a long-run appreciation, then people would start hoarding dollars and using bitcoin as money instead, but that isn’t going to happen because we have a competent central bank that will never let dollars appreciate in value.
(Aside: the last time the dollar really appreciated was the Great Depression and that was a major reason why it is called “great”. It could have been a little recession with better central banking. When the dollar started rising in value, people started hoarding dollars rather then spending them which meant that spending plummeted as everyone tried to buy as little as possible which caused incomes to plummet.)
Bitcoin is more like gold than money because both are used as stores of value and neither are money. If bitcoin continues to grow in popularity, it won’t replace money, but it could be a substitute for investing in gold and cause the value of gold to drop! Bitcoin is a fantastic substitute for gold because both are used to hedge system failure. Gold and bitcoin are both very volatile in value because they are mainly used as speculative stores of value.
Speculators capriciously speculate about future values rising (and selling when they think future values will fall) and that speculation helps drive the price volatility of goods that are primarily used as a speculative store of value. In fact, the more that something comes to be seen as primarily a store of value rather than as something that is valued for its intrinsic usefulness, the more volatile its price becomes. For example, housing bubbles are not caused by people who just want an economical place to live long run, but by speculators who see housing as a growing store of value and are hoping to resell at a profit in the near future. Although bitcoin proponents like to tout rapidly rising value as a sign of success, that appreciation causes a major problem for bitcoin as a medium of exchange because nobody wants to exchange something that it rapidly rising in value. They want to hoard it instead.
In contrast, a modern fiat money almost never goes up in value, so the main reason people hold it is as a medium of exchange. Central banks actively manage the value of every successful modern money to keep it reliably predictable and one way they try to prevent money from being used as a store of value is by engineering a little inflation which steadily reduces the long-run value of money. Inflation gives speculators an incentive to buy other things (like stocks, bonds, money-market shares, gold or bitcoin) as stores of value rather than money. It is the “animal spirits” of speculators that cause most price volatility in financial markets and by making money a bad long-run bet for speculators, central banks make their job easier to reduce the volatility of the value of money. Because money is held for use as a medium of exchange, there is little speculation about how much it should be worth and so its value does not change unpredictably which makes it more useful as both a unit of account and a medium of exchange.
Bitcoin is not money because nobody uses bitcoin (nor gold) as a unit of account (for measuring value) and that is the most important function of money. Bitcoin sucks as a unit of account because the value of bitcoin jumps around much more capriciously than most goods. Even fresh pork bellies would be a better unit of account than bitcoin because it has a more stable value! The US dollar has been the best money in the world for many decades as judged by international businesses. For example, oil producers in the Middle East use the dollar as their unit of account for selling to everyone because it is the most convenient unit of account for everyone around the world. It is also frequently used as a medium of exchange between companies that do not use dollars at home. For example, Airbus has often sold airplanes in places like Argentina using dollars. Even though Airbus is a European consortium and neither Airbus nor their customer use dollars at home, it can be more convenient to exchange pesos for dollars and then dollars for airplanes and then exchange the dollars for euros, than to exchange pesos for euros directly and buy with euros.
According to Mark Williams, as of 2014, bitcoin had volatility seven times greater than gold, eight times greater than the S&P 500, and 18 times greater than the U.S. dollar. Even the Bitcoin Foundation sets its employee’s salaries in dollars rather than in bitcoins. Because bitcoin (and gold) are bad units of account, they are rarely used as a medium of exchange except by criminals. Bitcoin has a major advantage for criminal exchanges because it is untraceable by any police, but for everyone else, the transactions costs due to high price volatility outweighs any other advantage of bitcoin for use as money.
The block chain technology that bitcoin is built on could offer a more efficient way of making payments at some point, but prices will always be quoted in money (a unit of account) such as dollars because dollars have a stable value. And as long as dollars are used as the unit of account, they will also be used as primary medium of exchange too because that reduces transactions costs. For this reason bitcoin will never replace money, but the technology does have some advantages for reducing transactions costs in certain circumstances. However those technologies can be adopted by the dollar-based banking system or a payment provider like PayPal to reduce transactions costs. It would be great to modernize our antiquated money transfer system, but the new technologies will still mostly exchange dollars rather than bitcoins.
The big long-run problem with bitcoin is that it will go obsolete as soon as a newer block-chain technology is produced that works better than bitcoin. Bitcoin cannot change (or only with extreme difficulty) and all digital technologies that cannot change get replaced by newer technologies sooner rather than later. The probability that bitcoin will be replaced by a better blockchain technology at some point is the main threat to bitcoin. Newer technologies will make it obsolete, and then the value of bitcoin will collapse like the value of telegraph companies. Or bitcoin could collapse in value overnight when its security is successfully attacked with new technologies or governments might just ban its use either to clamp down on illegal transactions or to reduce rampant energy use.
Bitcoin is just an information technology and innovation in that world is rapid with better technologies continually evolving. At some point bitcoin will seem so inferior to its alternatives that the value of bitcoin will collapse to near zero a bit like the value of the Confederate dollar or other defunct currencies that went obsolete. Bitcoin was the first blockchain currency, but it is such an inefficient technology that it is unlikely that it is the best blockchain technology. It has already been surpassed in transactions by Ethereum currency.
Most people are excited about bitcoin based on the theory that it could eventually become a new global money, but it is never going to beat government money as a medium of exchange (for legal transactions), nor as a unit of account unless governments collapse.
All stores of value must have some underlying value. Fiat money (like the dollar) is truly useful because it really does minimize transactions costs as a medium of exchange which produces its underlying value. If there were something else that was better at facilitating exchange transactions (like bitcoin), we would use it instead of dollars and the dollar would become worthless because it has no other fundamental source of value. Commodity monies like gold and silver can rise and fall in value, but they cannot fall to zero (and did not fall to zero when fiat money replaced them for transactions) because they are inherently useful for other things besides facilitating transactions. They are used for industrial production and for making beautiful things like the shiny gold plating that Donald Trump likes to surround himself with. Neither bitcoin nor fiat money have any other value if they aren’t the cheapest medium of exchange in somewhere.
Even poorly-managed fiat money cannot fall completely to zero value because governments requires that everyone pay taxes using their fiat money. Almost a quarter of US income is paid in taxes each year and that would prevents the value of dollars from falling to zero even if the Fed were incompetent. But the Fed manages the dollar well which makes it the best kind of money for every other transaction in America (and a disproportionate share of international transactions) too.
Bitcoin gets its fundamental value because cryptocurrency is the best form of money for a significant fraction of the World’s economy. It is the cheapest and best form of payment for evading taxes, criminal transactions, and funding terrorism. Although there are also some ideologues who are willing to use it for legal transactions despite its higher cost, the main value of bitcoin depends upon how much governments are willing to tolerate the black-markets it sustains. Because its main advantage is for use by terrorists and criminals, the police could shut down the companies that exchange bitcoin for money at any time and that would make bitcoin virtually worthless for criminals who rely upon money for most transactions and only need bitcoin for illegal transactions.
One last fundamental function for bitcoin (and gold) is as a hedge against economic collapse.
…one reason gold is valuable is that some people see it as a hedge against the collapse of governments. In medieval and early modern Europe, as well as in many other premodern states, gold was used as money for cross-border payments because governments weren’t stable enough to be able to maintain stable fiat currencies. Even if we never return to that sort of anarchic world, people might want some kind of insurance against the possibility.
Gold’s current total market cap is estimated at a bit over $10.6 trillion. Bitcoin’s market cap, as of this writing, is about a tenth of that. So if Bitcoin were to become as big of a hedge against global disaster as gold is, it would probably be worth a lot more than it is now.
Another fundamental reason for Bitcoin to have long-term value is its usefulness in [illegal activities] or use as a currency in places where the government has broken down, [such as] where hyperinflation makes local fiat currency effectively useless…
In general, all of these uses can be grouped under a single umbrella concept: System failure. The system of governments, banks, financial regulations, etc. etc. that currently runs the world is not infinitely robust. In the places and times and future conditions in which that system fails, peer-to-peer financial solutions like Bitcoin are inherently very valuable. That gives Bitcoin fundamental value.
So bitcoin could be useful if the ordinary banking system collapses, but again, this is a motive for using bitcoin as a store of value because it could become useful as a form of money at some point if our ordinary monetary system collapses.
Ordinarily a fiat money like the US dollar is cheaper to use than bitcoin as a medium of exchange because 1) its value is more stable because it is actively managed by the central bank which makes it a better unit of account; 2) it is required for paying taxes so Americans have to have dollars; 3) the fact that everyone uses dollars creates a kind of economy of scale called a network effect which makes dollars more convenient to use simply because all other Americans are already using them; 4) bitcoin is structurally prone to deflation which would contribute to recessions if it were adopted for an entire economy. That fact alone will prevent any sovereign economy from adopting it.
5) Bitcoin is expensive to store and gets more expensive and environmentally destructive as the bitcoin economy expands. Most importantly, 6) bitcoin transactions are extremely expensive and slow relative to dollar transactions in the conventional banking system. As Marketwatch points out, “Credit cards can settle 5,000 transactions per second. One bitcoin transaction takes 10 minutes.” Visa and Mastercard charge about 3% transaction fee which is a ridiculously large, inefficient monopolistic fee. Hopefully a blockchain technology will be able to force down at some point, but bitcoin transactions are much more expensive than Mastercard:
to use bitcoin to buy a $4 latte at Starbucks, you might have to either wait several hours for the purchase to go through or pay $5 to speed it up. “One of the biggest challenges for bitcoin has been that the fees are too high for it to be used as a simple transaction account, and it takes too long,” O’Hara said. “The number of bitcoin transactions that can be added in any given time is orders of magnitude smaller than, say, Visa cards.”
“Free” bitcoin transactions costs are actually paid by bitcoin “miners” who do the calculations in exchange for the system “printing” new bitcoins for them, and they consume an incredible amount of electricity in this process which is tremendously expensive and wasteful.
Bitcoin mining alone uses more electricity than 159 different countries and in order to make it worthwhile for miners to continue processing transactions, bitcoin will have to deflate in value because there is a finite amount of bitcoin that can be “mined” and as we approach that hard limit, the costs of mining (processing transactions) continues to rise, plus there are limits to how many blockchain transactions can be processed per minute. Perhaps that is why we reached peak Bitcoin transactions way back in 2017:
Meanwhile, the rising expense of processing transactions won’t be worthwhile unless the value of bitcoin continually rises. That may sound good, but a rising value of a currency is called deflation and deflation is extremely harmful for an economy when it is caused by a money supply that does not expand as fast as the number of transactions that people want to make. Because the costs of processing Bitcoin transactions must rise over time, it will continue to get even worse as a medium of exchange. Inflation is much healthier for macroeconomic stability than the same amount of deflation because deflation turns money into a store of value which causes hoarding rather than the transactions that make the economy go round.
Bitcoin’s technology has some advantages, but the dollar is better for almost all legal transactions. Plus, if the technological advances of blockchain were truly important, some part of the dollar banking system would easily copy them. The only real advantage of bitcoin seems to be facilitating criminal transactions and it isn’t even ideal for that use because although it does provide a degree of confidentiality, it is anything but anonymous because every transaction made from every account is public information for everyone. Other technologies provide both confidentiality and anonymity, including good old-fashioned cash.
So far bitcoin speculators have been hoping that bitcoin’s technological advantages will eventually prove to be so much better than the dollar as a medium of exchange that everyone will someday want bitcoins for conducting all their daily business (except paying taxes presumably). But it is more likely is that the dollar system will eventually adopt some of bitcoin’s technologies and wipe out what little advantages bitcoin currently has for exchanges. Plus, because bitcoin’s main advantage for exchange has been its ability to fund illegal activities, it will probably eventually be used to fund a major terrorist act and that will motivate large governments to clamp down on the exchanges that connect the bitcoin network to the global financial network. That would be the sudden end of bitcoin except as a historical curiosity like the great tulip bubble of 1637.
I hope that doesn’t happen because bitcoin is that it provides a backstop alternative for the fiat monies of the world. A fiat money is always in peril of being managed badly and that has dire consequences for the people who depend upon it such as in the Zimbabwe hyperinflation. But if a fiat money ever becomes a worse option than bitcoin, then people can switch and bitcoin could be used as a last-ditch money in that case. Bitcoin may be inefficient, but it would be better to have a really bad form of money than no money.
But I’d rather have gold, because if the US government collapses, then our communications and electric grid will also probably collapse and that would make bitcoin useless. So bitcoin provides some insurance for the world’s monetary system, but it isn’t a very secure insurance. For example, in Zimbabwe’s economic collapse most people have been using the fiat currencies of other nations, most commonly, the US dollar, rather than bitcoin. There is simply no major economy where bitcoin has replaced fiat currencies as the main medium of exchange except in some parts of the criminal underworld.
But bitcoin is a fascinating new kind of store-of-value, a lot like baseball cards and other collectables.