Why Does Money Have Value? The Answer Most Economics Gets Wrong

Why does a piece of paper with an ink portrait on it have value? Why can you exchange it for a meal, a house, or an hour of someone's labour? The question sounds simple. Most answers to it are wrong.

This article is part of our What Is Money? series.

The Wrong Answers

"Because the government says so"

Legal tender laws require creditors to accept a currency for settlement of debts. They do not create value. The Venezuelan bolívar is legal tender. The Zimbabwean dollar was legal tender. Both became worthless while the legal tender laws remained in force. Government decree can compel acceptance. It cannot compel purchasing power.

"Because it's backed by something"

Modern fiat currencies are not backed by anything. The dollar is not redeemable for gold, silver, or any commodity. It is a liability of the Federal Reserve, redeemable for nothing but another Federal Reserve liability. The same is true for every major currency. The "backing" answer was accurate under the gold standard. It has not been accurate since 1971.

"Because everyone agrees it has value"

This is closer to the truth but is circular. Why does everyone agree? What makes them start agreeing? What would make them stop? The "collective agreement" framing describes the outcome but not the mechanism.

The Real Answer: Subjective Value + Monetary Properties

Carl Menger, writing in 1871, provided the answer that has held up for 150 years. Money has value because individual actors, making independent subjective judgments, find it useful as an intermediate good in exchange. Its value is not objective. It is not decreed. It is the aggregate outcome of millions of individual decisions about what to hold between transactions.

What determines which goods are selected? The properties of sound money: scarcity, durability, portability, divisibility, and verifiability. The good that scores highest on these properties, in a given technological context, tends to be selected as money. This is not a policy decision. It is a market process.

Network Effects

Money also benefits from network effects. The more people who accept a monetary good, the more useful it is to each individual holder. This creates a self-reinforcing cycle: adoption increases utility, which drives further adoption. This is why monetary transitions, once they begin, tend to accelerate.

It is also why monetary transitions are rare. The existing money has an enormous network-effect advantage. For a challenger to displace it, the challenger must be sufficiently superior on the core properties that it overcomes the incumbency advantage. Gold displaced silver because it was harder. Fiat displaced gold because it was more portable (in the short term). Bitcoin challenges fiat because it is harder, more portable, more divisible, and more verifiable — simultaneously.

Why Bitcoin Has Value

Bitcoin had no value on 3 January 2009. The first known commercial transaction — 10,000 BTC for two pizzas — occurred on 22 May 2010. Since then, its value has grown from zero to trillions of dollars in total market capitalisation.

No government decreed this. No institution backed it. No advertising campaign promoted it in its early years. Value emerged because individuals, making independent judgments, concluded that bitcoin was a useful monetary good — and the properties that make it useful are measurable and superior to the alternatives.

The fact that Bitcoin acquired value without government backing is not a puzzle. It is a confirmation of Menger's theory: money is a market phenomenon, not a state phenomenon. The state can capture money. It cannot create it from nothing. The market does that.

For the full context on how money emerges and evolves, see A Short History of Money.