Different Types of Money

Money, at its core, is a technology, a tool societies invent to solve the problem of exchange. Without it, we would have a very inefficient barter system. The differences between different types of money matter far more than most people realize. Here is a brief overview of the three major forms money has taken throughout history, and how they work.

Economists generally agree that for something to qualify as money, it needs to do three things: serve as a medium of exchange (people accept it for goods and services), a store of value (it holds purchasing power over time), and a unit of account (you can price things in it). Every type of money we'll discuss passes these tests to varying degrees.

Fiat money is what most of the modern world uses every day. The dollar, the euro, the yen, the pound, and more, are all fiat currencies. The word "fiat" comes from the Latin word for decree: fiat money has value because a government declares or decrees it does and compels its use through legal tender laws. There is no gold bar, no silver coin, no physical commodity backing it. It is, as Thomas Jefferson once put it, the ghost of money.

The great advantage of fiat currency is flexibility. Central banks can expand or contract the money supply in response to economic conditions, printing more money to fight recessions, tightening supply to fight inflation. This is enormously powerful, and enormously dangerous. History is littered with examples of fiat currencies destroyed by overissuance: Weimar Germany's hyperinflation, Zimbabwe's hundred-trillion-dollar notes, Venezuela's ongoing collapse. The supply of fiat money is, in theory, unlimited, and constrained only by political will and institutional discipline.

In its modern digital form, fiat currency is highly portable and universally accepted. Most of your fiat money likely doesn't exist as paper at all, but is a number in a bank’s database. Its biggest vulnerability is trust: the moment people stop believing in the institution behind it, its value can evaporate.

Gold and silver are humanity's oldest money. They were used as currency for roughly 5,000 years before the 20th century finally severed the dollar's last link to gold (in 1971, when President Nixon closed the gold window). The reasons metals became money are intuitive: they are scarce, durable, divisible, fungible, and intrinsically useful. You cannot print more gold. You can only dig it out of the earth at great expense.

This scarcity is metals' defining virtue and defining limitation simultaneously. It means no government or central bank can debase a gold-backed currency by decree, they are constrained by physical reality. The Founding Fathers, scarred by the Continental dollar's collapse, wrote gold and silver explicitly into the Coinage Act of 1792 for exactly this reason.

The limitations are equally physical. Gold is heavy and difficult to divide into small denominations for everyday purchases. Transporting it across borders is cumbersome. In a world of global digital commerce, carrying coins around is not a practical solution. Today, precious metals function primarily as a store of value and inflation hedge. A place to park wealth outside the banking system rather than as a medium of daily exchange.

Cryptocurrency is the newest form of money, born in 2009 with the launch of Bitcoin by the pseudonymous Satoshi Nakamoto. It attempts a remarkable synthesis: the scarcity of precious metals, enforced not by geology but by mathematics, combined with the portability and divisibility of digital currency, without any central authority controlling the supply.

Bitcoin's total supply is hard-capped at 21 million coins. This limit is written into the protocol's code and enforced by a global network of computers. No central bank can vote to print more. This was a direct and deliberate response to the failures of fiat currency, and the intellectual debt to the Founding Fathers' hard-money arguments is not lost on many in the Bitcoin community.

Transactions on a blockchain are recorded on a distributed ledger where thousands of computers worldwide maintain identical copies, making the record nearly impossible to falsify or erase without great cost and energy expenditure. Transfers can happen globally in minutes, without banks or borders. For the unbanked populations of the world, this is genuinely revolutionary.

The weaknesses of Bitcoin are also significant. Price volatility has been extreme as it goes through an adoption curve, making it a poor unit of account for everyday pricing for now. On the longer term, no one has lost money if they held it for 4+ years, and many holding for that length of time or longer are more than offsetting inflation. Regulatory uncertainty varies wildly by country, as some try to ban it, which is virtually impossible. The technical aspect of securely holding Bitcoin remains a barrier for many users, but it is improving over time, and not very difficult in reality.

IMPORTANT NOTE: “Altcoins,” or cryptocurrencies outside of Bitcoin, are by and large not decentralized despite any claim to the contrary, and are centralized scams issued by naive or scammy founders, riding Bitcoin’s coattails and suckering people into losing money. I do not own or recommend anyone hold altcoins.

Each of these systems represents a different answer to the same ancient question: how do we create something everyone will trust to hold value? Fiat currency answers with political authority. Metals answer with physical reality. Bitcoin answers with mathematics and decentralized consensus.

None has solved the problem perfectly. Fiat is flexible but fragile to political abuse; politicians most often can’t be trusted. Metals are trustworthy but impractical in a digital world. Bitcoin is innovative but still volatile and maturing. Overall, it is my belief that Bitcoin is the best choice going forward for preserving value and avoiding inflation, government censorship and theft, but many still don’t understand how easy and safe it is to use in reality.

NOTE: none of this should be considered financial advice, please do your own research.