What is sound money?
Sound money is a bundle of properties, not a specific substance. Gold satisfies most of them. Bitcoin satisfies more. Fiat currencies satisfy fewer every decade. Here’s the short, honest answer — what it means, why it matters, and what’s still missing.
The short answer
Sound money is currency that reliably holds its value over time because its supply cannot be expanded arbitrarily. That’s it. Everything else is commentary on how, specifically, a given currency achieves that reliability — or fails to.
The practical test is simple. If one unit of your money buys a comparable basket of real-world goods this year, next year, and in ten years, your money is sound. If each year the same unit buys a little less, or occasionally buys much less, your money is not sound. The reason doesn’t matter for the test. The outcome does.
Sound money is a property bundle. Credibly scarce, durable, portable, divisible, verifiable, and neutral. When a currency scores high on all six, it tends to preserve real purchasing power over decades.
The six traditional properties
Economists going back to Menger and Jevons in the 19th century have converged on roughly the same list of properties that a good money should have. Different writers add or subtract one or two, but the core six are stable:
The critical word in that list is credibly. Scarcity on paper is easy — any currency could be declared fixed-supply. What’s hard is credibly committing to that rule when political pressure mounts: a war to fund, a banking crisis to paper over, a populist deficit to finance. Sound money has to be hard to un-sound, not just sound today.
Where the term comes from
The phrase “sound money” entered political vocabulary in the 19th century, most prominently during the American bimetallism debate of the late 1800s. One faction wanted the country to stay on a strict gold standard — the “sound money” camp. The other wanted to expand the monetary base by coining silver at a fixed ratio to gold, easing the debt burdens of farmers and miners — the “soft money” camp. William Jennings Bryan’s 1896 “Cross of Gold” speech is the most famous rhetorical artifact of that fight.
The theoretical framework around sound money developed later, largely in the Austrian school. Carl Menger wrote about how money emerges from trade without anyone planning it. Ludwig von Mises elaborated a theory of monetary expansion driving boom-and-bust cycles. Friedrich Hayek, in his 1976 book Denationalisation of Money, went further and argued that governments should not hold a monopoly over money at all — that competition between private currencies would produce sounder money than any central bank could.
The through-line across all these thinkers is the same: sound money requires taking the money supply out of discretionary political control. How you accomplish that — commodity standard, fixed rule, competition, code — is an engineering question. That the issuer cannot unilaterally expand the supply is the non-negotiable.
Which candidates actually qualify?
There’s no single objectively sound currency. Every candidate scores high on some properties and low on others. The honest thing to do is compare them side by side and see where each breaks down.
| Scarce | Durable | Portable | Divisible | Verifiable | Neutral | Stable | |
|---|---|---|---|---|---|---|---|
🪙 Gold | |||||||
🥈 Silver | |||||||
💵 Fiat USD | |||||||
₿ Bitcoin | |||||||
🪢 USD stablecoin | |||||||
🎯 M69 target (M$) |
Notice what’s happening in the rightmost column. Gold, silver, and Bitcoin — the traditional sound-money candidates — all score poorly on stability in daily use. Their purchasing power relative to goods and labor moves around substantially from year to year. For a saver, that’s less of a problem than debasement. For someone paying rent in it, it’s a real obstacle.
The USD scores inversely. It’s extremely stable month to month, unusably scarce over decades, and unusually centralized. The USD is comfortable in the short run and corrosive in the long run — which is exactly the opposite of what sound money is supposed to be.
Hard money vs sound money — are they the same?
The two terms are often used interchangeably, but they point at slightly different things.
Hard money
Traditionally means currency backed by — or consisting of — a physical asset with intrinsic value. Gold coins are hard money. Silver certificates redeemable for silver are hard money. The argument for hard money is that a physical backing anchors the unit to something real that can’t be created by decree.
Sound money
Is broader and more about the properties than the substance. A currency is sound if it reliably holds its value, regardless of whether that reliability comes from a physical anchor, a credible algorithm, or a credible institution.
By this distinction, all hard money is sound, but not all sound money is hard. Bitcoin is sound money for most definitions — its supply is credibly scarce — but it’s not hard money, because no physical asset backs it. The backing is code and network effects.
What’s missing: stability in daily use
Here’s the uncomfortable truth that most sound-money writing sidesteps. The classical candidates (gold, silver, Bitcoin) preserve long-term purchasing power reasonably well. They don’t preserve short-term purchasing power well at all. A Bitcoin holder in 2022 watched their savings move through a 60% drawdown in a year. A gold holder between 2011 and 2015 watched a 45% drawdown. That’s not great for paying rent.
The fiat system solved the daily stability problem — your dollar on Tuesday is worth almost exactly what it was on Monday — at the cost of long-term erosion. The sound-money candidates solved the long-term erosion problem at the cost of daily volatility. Neither fully solves the actual job of money, which is to be a reliable unit of account both today and in ten years.
This two-axis view is the argument for a different kind of sound money. If a currency could score high on both soundness and daily stability, that’s the missing upper-right quadrant. The Money2069 Manifesto calls that target “spending-power-stable, state-free money” and it’s the entire reason this project exists.
Why sound money matters
The case for sound money doesn’t require grand economic theory. It follows from a simple observation: soft money has long-term effects that compound.
- Savings erode.A dollar saved in 1970 buys about 15 cents' worth of real goods today. Patient saving stops being rewarded, which breaks the incentive structure that underwrites long-horizon investment and retirement planning.
- Capital misallocates.When money is expected to lose value, people buy assets primarily to outrun inflation rather than because the asset is productive. This inflates asset prices (housing, equities, collectibles) relative to incomes — hitting the young and renters hardest.
- Wealth concentrates.Whoever receives newly-created money first (large banks, first-in-line borrowers, government contractors) spends it before prices adjust. Whoever holds old money — mostly wage earners and retirees — eats the adjustment. This is Cantillon distribution, and it's well-documented in the post-1971 wealth gap.
- Time horizons shorten.When money is unreliable, you cannot plan twenty years out. Businesses stop building for the long run; politicians stop legislating for it. You get shorter cycles, bigger crises, and an economy that runs on adrenaline instead of compounding.
None of this is a theoretical problem. The currency debasement pattern is documented in 2,300 years of monetary history. The outcomes — inflation, asset bubbles, wealth concentration, eventual collapse — are reliably what happens when the party that issues the money also writes the rules about the money. Sound money is an attempt to decouple those two powers.
The Money2069 proposal: sound and stable
Money2069’s working hypothesis is that the traditional sound/soft tradeoff isn’t fundamental. It was imposed by the available technology. You couldn’t dynamically adjust the supply of gold in response to real economic activity without breaking the “external, scarce, neutral” properties that made gold sound in the first place. Modern cryptographic systems can encode supply rules that respond to external economic signals without introducing a political authority. That wasn’t true in 1900.
If that’s right — if you can have a currency whose supply follows a credible rule tied to real-world economic activity, measured transparently, and adjusted by code rather than committee — then both axes can be satisfied at once. That’s the M$ target: all six traditional sound-money properties, plus explicit stability in daily use.
Whether this is actually achievable is an open question. The Money2069 project exists to find out — by funding the research, coordinating the builders, and standing up a community of people who treat the problem seriously. M69 is the alignment token that makes that community economically viable.
