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Store of value vs medium of exchange vs unit of account

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Money traditionally serves three functions: store of value, medium of exchange, and unit of account. The standard textbook treatment lists them as parallel features, but the Mengerian-Austrian tradition — extended by Nick Szabo's anthropological work and Saifedean Ammous's modern synthesis — shows they emerge sequentially and overlap in phases as a good monetizes. A monetary good first becomes a collectible (proto-store-of-value), then a true store of value, then a medium of exchange, and finally a unit of account, with the phases overlapping rather than replacing each other. Bitcoin is currently transitioning from the collectible phase into the store-of-value phase, with the medium-of-exchange and unit-of-account phases still ahead. The framework dissolves the most common criticism of Bitcoin ("you can't buy coffee with it") by showing that no money in history has been a medium of exchange before first establishing itself as a store of value.

Why this framework matters

The store-of-value vs medium-of-exchange vs unit-of-account framework is one of the most clarifying lenses in monetary economics — and one of the most consistently misunderstood. Mainstream economics treats the three functions as parallel features that money fulfills simultaneously. The Mengerian-Austrian tradition — Menger’s 1892 On the Origin of Money, extended by Mises, Szabo, Boyapati, and Ammous — recognizes them as evolutionary stages in monetization, acquired in turn rather than at once.

The framework accomplishes four things. It explains Bitcoin’s current state: not failing as money but operating in the theoretically predicted phase. It defeats the “nobody buys coffee with it” criticism by showing no money has ever become a medium of exchange before first establishing itself as a store of value. It provides a roadmap for the phases ahead — medium of exchange and unit of account — as the historically observed pattern of how monetization completes. And it situates Bitcoin within deep monetary history alongside shells, beads, cattle, salt, silver, and gold.

This is the synthesis note that connects deep history (Menger, Szabo) to current reality (Boyapati, Ammous) to future projection.

The three functions defined

Before tracing the sequence, let’s establish what each function actually is.

Store of value

A store of value is something that preserves purchasing power across time. Wealth saved today can be retrieved as wealth tomorrow, next year, or in a generation.

The defining property is that the good can be held over time without significant loss of value. The store of value function is about time: connecting present production to future consumption.

Historical examples: gold, silver, real estate, art, durable consumer goods (in inflationary environments), Bitcoin. Modern fiat currencies serve this function poorly — they lose 2-10% per year typically, or much more during crises.

Medium of exchange

A medium of exchange is something used in transactions to overcome the double coincidence of wants problem. Rather than having to find someone who has what I want and wants what I have, I can sell what I have for money, then use the money to buy what I want.

The defining property is widespread acceptance for transactions. The medium of exchange function is about space and counterparties: connecting different people in trade.

Historical examples: gold and silver coins, paper banknotes, modern fiat currencies, increasingly stablecoins for cross-border payments. Bitcoin’s role here is currently limited — it serves as medium of exchange in some specific contexts (cross-border transfers, censorship-resistant payments, illicit markets) but not yet for everyday commerce in most places.

Unit of account

A unit of account is the standard against which prices are measured and contracts are denominated. When you ask “how much does this cost?”, the unit of account is the currency in which the answer is given.

The defining property is that everything in the economy is priced in it. The unit of account function is about coordination: providing a common language for value across the entire economy.

Historical examples: the British pound during the classical gold standard era, the US dollar throughout most of the world today, the euro in the eurozone. The unit of account is typically the most “sticky” function — once established, it is very hard to displace because all contracts, accounting systems, and economic mental models are denominated in it.

Bitcoin is far from being a unit of account anywhere. Even El Salvador, which made Bitcoin legal tender in 2021 before repealing that status in 2025, priced most goods in US dollars throughout.

The textbook trap

The standard textbook treatment lists these three functions as if they are coequal and simultaneous. This is misleading because:

  1. It implies money “is” something that has all three, missing the fact that they emerge sequentially
  2. It treats the absence of any function as disqualifying (“Bitcoin can’t be money because no unit of account”)
  3. It obscures the historical reality that every successful money has gone through phases
  4. It fails to predict how new monetary goods will evolve

The Mengerian framework — which we’ll trace now — is more powerful and more historically accurate.

Carl Menger and the origin of money

Carl Menger’s On the Origin of Money (1892) is the foundational theoretical text on monetization. Menger asked a deceptively simple question: how does money emerge in the first place, without anyone planning it?

His answer revolutionized monetary theory.

The salability concept

Menger introduced the concept of salability — Absatzfähigkeit in the original German. A good is highly salable if it can be sold quickly and easily without significant price concession. A good is poorly salable if selling it requires waiting for the right buyer or accepting a substantial discount.

Different goods have vastly different salabilities. A diamond is poorly salable — finding a buyer at fair price takes time. A bushel of wheat is moderately salable in agricultural markets. A gram of gold is highly salable almost anywhere.

Salability is itself decomposable into dimensions:

  • Salability across scales — can the good be divided into smaller units for small transactions and aggregated for large ones?
  • Salability across space — can the good be transported across distances without significant loss?
  • Salability across time — can the good be held over time without losing value?

The market discovery process

Menger’s central insight: market participants, acting in their own self-interest, gradually converge on whichever goods have the highest overall salability. This is a discovery process, not a designed system.

The logic: I want to trade my labor for the goods I need. If I cannot find someone who needs my labor and has what I want, I will accept something else in trade — but only if I expect to be able to re-trade that something for what I actually want. The more salable the intermediate good, the more confident I can be in this re-trade.

This pushes participants toward the most-salable goods as intermediate exchange tools. As more participants converge on the same goods, those goods become even more salable (because more people accept them). The process is self-reinforcing.

Eventually, certain goods become so widely salable that they are accepted by almost everyone — and they have effectively become money. No one planned this. No government decreed it. The market discovered it.

The implication

For Menger, money is not a creation of the state. It is an emergent property of voluntary exchange. The state may later adopt, regulate, or monopolize money, but it does not invent it.

This is a foundational insight that runs through everything. Bitcoin emerging on the cypherpunk internet in 2009 is exactly the kind of phenomenon Menger’s framework predicts: market participants converging on the most-salable good in a particular context (digital scarcity, censorship resistance, mathematical hardness), without any state involvement.

See: Carl Menger, Bitcoin as emergent money, Mises and the theory of money.

Nick Szabo and the deep history

Nick Szabo’s 2002 essay Shelling Out: The Origins of Money extends Menger’s framework into anthropology, evolutionary psychology, and archaeology. Szabo’s contribution is to show that the monetary instinct in humans is far older and stranger than economics typically assumes — and that the store-of-value function preceded the medium-of-exchange function by tens of thousands of years.

The collectibles thesis

Szabo argues that early humans (Homo sapiens sapiens) developed an evolutionary preference for collecting durable, scarce, costly-to-produce objects: shells, beads, animal teeth, worked flints, jewelry. These objects had no obvious functional purpose. They were not tools. They could not be eaten. They required substantial effort to produce.

Yet Homo sapiens sapiens collected them obsessively, while their cousins (Neanderthals) did not. And the archaeological record shows these collectibles spreading across vast distances, far from their points of origin.

Szabo’s interpretation: these collectibles were proto-money. They served as stores of value that enabled wealth transfers across:

  • Time (inheritance, intergenerational wealth)
  • Space (trade between distant tribes)
  • Risk (starvation insurance — accepting collectibles in good times, redeeming in bad)
  • Social bonds (bride prices, dispute settlements, gift exchange)

The shell beads found at Blombos Cave in South Africa (~75,000 BP) are among the earliest known examples. The Kula ring in Melanesia, the wampum of North American tribes, the cowrie shells of West Africa — these are recent examples of a phenomenon that has been ongoing for tens of thousands of years.

”Unforgeable costliness”

Szabo identifies the key property that made collectibles work as proto-money: unforgeable costliness. A collectible had to be costly to produce or acquire (otherwise anyone could counterfeit wealth), and that cost had to be verifiable by the recipient (otherwise fakes would proliferate).

Shells from distant oceans, beads requiring skilled labor, perforated teeth from dangerous animals — each represented embodied cost that was hard to fake. Recipients could trust the value because the cost was apparent.

This is the same property that secures Bitcoin today. Proof-of-work makes each bitcoin costly to produce (real energy expenditure) and verifiable (anyone can check the chain). Szabo’s deep-history framework applies almost without modification.

Velocity and the store-of-value function

A crucial Szabo observation: paleolithic collectibles had very low velocity. They might be transferred only a handful of times in an individual’s lifetime — at marriage, at death, at major dispute settlements, during famines. They were primarily stores of value, with the medium-of-exchange function operating at extremely low frequency.

This is the foundational point: the store-of-value function of money is older and more fundamental than the medium-of-exchange function. Humans were storing wealth in collectibles for tens of thousands of years before anything we’d recognize as everyday transactional money existed.

The medium-of-exchange function evolved much later, as societies became more complex, trade more frequent, and the demand for transactional efficiency higher. But it was always built on top of an established store of value, not the other way around.

See: Shelling Out - Nick Szabo, Nick Szabo, Origins of money.

The four phases of monetization

Building on Menger and Szabo, Vijay Boyapati and Saifedean Ammous have developed the most useful modern framework for understanding how a good monetizes. They identify four overlapping phases:

Phase 1: Collectible

The good is acquired and held by a small group who recognize qualities in it — scarcity, beauty, novelty, technical interest — that they value. There is no broad market consensus on its value. Prices are extremely volatile. The good has no clear use as money yet, but a community of early adopters builds.

Bitcoin in this phase: 2009 to roughly 2013-2015. Held by cypherpunks, technologists, and ideologically-motivated early adopters. Prices ranged from fractions of a cent to a few hundred dollars. Use was experimental — testing the network, ideological statements, niche commerce (Silk Road).

Phase 2: Store of value

Broader recognition develops that the good preserves value over time. More participants begin to acquire and hold it as savings. Liquidity deepens. Volatility, while still high, begins to decline. Institutional and high-net-worth participants enter. The “store of value” narrative becomes the dominant framing.

Bitcoin in this phase: Roughly 2016 to present. The institutional adoption wave (MicroStrategy, corporate treasuries, ETFs, sovereign reserves) is the clearest signal. The dominant narrative is “digital gold” — Bitcoin as a non-sovereign store of value. Prices have ranged from thousands to over a hundred thousand dollars. Still volatile, but trending toward greater stability.

Phase 3: Medium of exchange

As volatility declines and adoption deepens, the good becomes usable for transactions. Merchants begin accepting it. Payment infrastructure develops. The transaction costs of using it (denominated in opportunity cost of not holding it) decline because price appreciation slows.

Bitcoin in this phase: Limited entry. Lightning Network and other layer-2 solutions enable Bitcoin transactions at scale. El Salvador’s 2021–2025 legal-tender experiment briefly put Bitcoin into limited everyday use before the status was repealed. Cross-border remittances increasingly use Bitcoin. But for most people in most places, Bitcoin is not yet meaningful as a medium of exchange.

Phase 4: Unit of account

The good becomes the standard against which other goods are priced. Wages, contracts, accounting, and economic mental models all denominate in it. This is the final phase of monetization — and the hardest to displace once established.

Bitcoin in this phase: Not yet. Even in El Salvador, prices remain dollar-denominated. The unit of account function is currently held overwhelmingly by the US dollar globally and by national currencies regionally. Displacing this is a multi-generational project.

The key insight: phases overlap

The critical point — and this is what most discussions miss — is that the phases do not replace each other. They overlap.

Bitcoin in 2026 is:

  • Mostly in the store-of-value phase (the dominant function)
  • Still partly in the collectible phase (held by enthusiasts and ideologues with strong conviction)
  • Beginning the medium-of-exchange phase (Lightning, ETFs as price exposure, niche transactional use)
  • Far from the unit-of-account phase (still priced in dollars)

This is structurally analogous to gold’s history. Gold spent millennia as a collectible (Phase 1, ~3000 BCE to ~600 BCE), then centuries as a store of value (Phase 2, alongside other monies), then perhaps a thousand years as a medium of exchange in coin form (Phase 3, ~600 BCE to ~1900 CE), and a few centuries as a unit of account (Phase 4, peaking in the classical gold standard era).

The phases overlapped throughout. Even at gold’s peak as a unit of account, it was still also a store of value and a medium of exchange. Even now, gold is mostly back to being a store of value with some collectible characteristics — the medium-of-exchange and unit-of-account functions have been lost.

Why the order matters

The order is not arbitrary. Each phase enables the next:

  • A good cannot be a store of value until enough people recognize it as having durable value (Phase 1 enables Phase 2)
  • A good cannot be a medium of exchange until enough people hold it as a store of value, providing the liquidity and acceptance for transactional use (Phase 2 enables Phase 3)
  • A good cannot be a unit of account until enough people use it as a medium of exchange, normalizing prices in its terms (Phase 3 enables Phase 4)

The reverse order is impossible. You cannot become a unit of account first — there must be enough transactional volume in the good for it to be the natural way to price things. And there must be enough holders for the transactional volume to exist.

This is why the “you can’t buy coffee with Bitcoin” criticism is so wrongheaded. No monetization has ever proceeded in that order. The history of money is universal in this regard: store-of-value first, medium-of-exchange later.

See: The Bullish Case for Bitcoin - Vijay Boyapati, Saifedean Ammous.

Saifedean Ammous’s synthesis

Saifedean Ammous’s The Bitcoin Standard (2018) provides the most comprehensive modern synthesis of this framework, building explicitly on Menger and Szabo while adding the Austrian monetary theory of Mises and Rothbard.

Salability across time as the master property

Ammous’s emphasis is on salability across time as the fundamental monetary property. The first two dimensions of salability (across scales, across space) are practical conveniences. The third — salability across time — is what makes a good actually viable as money.

Why? Because money exists to transport value across time. If a good cannot hold its value across time, it cannot serve as savings — and saving is the foundation of capital formation, civilization, and human flourishing.

This connects directly to the time-preference framework you’ve already built: hard money lowers time preference because it reliably stores value, allowing people to defer consumption with confidence.

See: Time preference and money, Low time preference as civilizational virtue, Hard money vs fiat money.

Stock-to-flow as the measure

Ammous argues that stock-to-flow ratio is the quantitative measure of salability across time. A good with a high stock-to-flow ratio (large existing supply relative to new annual production) is hard money — its value cannot be diluted by sudden new supply.

Throughout history, market participants have converged on whichever good had the highest stock-to-flow ratio available:

  • Beads, salt, cattle — moderate stock-to-flow, served as money in pre-industrial societies but failed when contact with higher-stock-to-flow monies exposed their weakness.
  • Silver — high stock-to-flow, dominant transactional money for centuries.
  • Gold — even higher stock-to-flow, won the long competition and became the global monetary standard.
  • Bitcoin — highest stock-to-flow in history, with the ratio continuing to harden indefinitely.

Each monetary transition in history has involved a higher-stock-to-flow money displacing a lower-stock-to-flow one. The pattern is consistent.

See: Stock-to-flow model, Bitcoin fixed supply and issuance schedule.

The “obsession with medium of exchange”

Ammous and Boyapati both point to a specific intellectual error in modern monetary economics: the obsession with the medium-of-exchange function.

In the 20th century, states monopolized money issuance and continually undermined the store-of-value function through inflation. This created a generational shift in what people thought money primarily was. Older generations remembered money that held its value across decades. Newer generations only experienced money that depreciated continuously, and so they identified money primarily by its transactional function.

This shift created the false belief that money is “really” a medium of exchange, with store-of-value being a secondary or optional property. The Austrian-Bitcoin tradition rejects this framing. Store of value is the foundational function, with medium of exchange being a derived function that requires a working store of value to operate.

When critics argue “Bitcoin isn’t real money because nobody uses it for transactions,” they are working from this 20th-century-distorted understanding. The longer historical view shows them to be wrong.

How phases overlap in practice

The phase framework is not a sequence of discrete jumps. It’s a gradient of overlapping waves. Understanding the overlap is essential for not misreading current developments.

The gradient

Imagine four overlapping waves rising over time:

Collectible           ____________
Store of value              ________________
Medium of exchange                     ________________
Unit of account                                _______________

At any moment, the dominant phase is the one with the highest amplitude — but all four are present to some degree.

For Bitcoin in 2026, the dominant phase is store of value (Phase 2). But Phase 1 (collectible) is still strongly present (some hold Bitcoin for ideological/community reasons more than monetary ones). Phase 3 (medium of exchange) is beginning to emerge (Lightning, niche commerce). Phase 4 (unit of account) is essentially absent.

The transitions between phases are gradual. Bitcoin started moving from collectible to store of value around 2013-2017. The transition is still incomplete. The next transition — to meaningful medium of exchange — has barely begun and may take a decade or more.

Why this matters for valuation

Each phase has different valuation dynamics:

  • Collectible phase: Value is driven by niche enthusiasm; small flows can move prices dramatically.
  • Store of value phase: Value is driven by competition with other stores of value (gold, real estate, equities); valued in terms of the total addressable market for savings.
  • Medium of exchange phase: Value is driven by transactional demand; valued in terms of velocity and economic throughput.
  • Unit of account phase: Value is essentially embedded; the question becomes “how much of the economy is denominated in it?” rather than “how much does it cost?”

For your interest in long-term price models, this matters. Bitcoin’s plausible price ranges depend heavily on which phase you’re modeling. Stock-to-flow models implicitly assume Bitcoin is moving through the store-of-value phase competing with gold. Power Law models assume continuing monetization through all phases. Both are reasonable framings but reflect different assumptions about where Bitcoin is and where it’s going.

See: Long-term price models and cycles, Stock-to-flow model, The Power Law model.

What this means for Bitcoin’s future

Several specific implications follow from the phase framework.

The “Bitcoin doesn’t work as money” criticism is structurally wrong

The most common critic objection is that Bitcoin can’t be money because:

  • “Nobody pays with it”
  • “It’s too volatile to be a unit of account”
  • “Merchants don’t accept it”

Each of these is a Phase 3 or Phase 4 observation applied incorrectly to a Phase 2 asset. The criticism implicitly assumes monetization should proceed in reverse order — that a good should be a medium of exchange first and a store of value later. This is contrary to all historical evidence.

The correct response: Bitcoin is doing exactly what monetizing assets do at this stage. Its lack of widespread transactional use is not a failure; it is the normal condition for Phase 2.

The transition to Phase 3 will take time

The medium-of-exchange phase requires:

  • Sufficient price stability (which requires Phase 2 to be substantially complete)
  • Adequate payment infrastructure (Lightning, custody solutions, point-of-sale)
  • Cultural normalization (people thinking of Bitcoin as money rather than investment)
  • Regulatory clarity in major jurisdictions

These conditions are developing but are years from being met broadly. The phase transition may begin in earnest in the 2030s.

Unit of account is the final, hardest phase

The unit-of-account function is the most “sticky” because it requires comprehensive coordination: contracts, accounting systems, wages, asset prices, government statistics, and mental models all need to denominate in the new unit.

This transition has happened historically (the British pound becoming global UoA in the 19th century, the dollar in the 20th), but it has taken decades each time and required massive geopolitical shifts.

For Bitcoin to become a unit of account, the dollar would need to lose that role globally — a transition that, even if underway, will take much of the 21st century to complete.

Bitcoin will be all three (plus the collectible aspect) simultaneously

At full monetization, Bitcoin will simultaneously be:

  • A store of value (the foundational function)
  • A medium of exchange (via Lightning and other layers)
  • A unit of account (with prices, wages, contracts denominated in BTC/sats)
  • Still partly a collectible (cultural significance, community identity)

This is the historical pattern. Gold at its peak was all of these things simultaneously. The phases don’t disappear when superseded; they layer.

See: Monetization S-curve, Bitcoin as emergent money.

The volatility paradox

One of the most counterintuitive implications of the phase framework: Bitcoin’s volatility, far from being a bug, is a structural feature of Phase 2.

The argument:

  • A maturing store of value must have a price-discovery process
  • That process involves capital flowing into the asset in waves as new participants recognize the thesis
  • Each wave moves the price, often substantially
  • The waves are interspersed with corrections as early holders take profit and the market consolidates
  • This produces volatility — but volatility toward higher prices over time

As Bitcoin approaches the market capitalization of gold (currently ~1.2 trillion — roughly 4%), the price-discovery dynamic should diminish and volatility should decrease.

Once Bitcoin meaningfully approaches Phase 3 (medium of exchange), the volatility requirement reverses — for transactional use, low volatility is essential. The same maturation process that monetizes Bitcoin reduces its volatility.

This is why Boyapati and others argue that Bitcoin’s volatility is not a permanent feature but a temporary one. As Bitcoin completes Phase 2, volatility should decline. By the time it is meaningfully in Phase 3, volatility should be at levels comparable to fiat currencies.

This argument is not a dismissal of volatility; it is a contextualization. Bitcoin’s volatility is real, but it is structurally appropriate to its current phase. Demanding low volatility now is demanding Phase 3 behavior from a Phase 2 asset.

See: Bitcoin volatility (not yet built), Psychological phases of the market cycle.

What gold teaches

Gold provides the most useful analog for Bitcoin’s monetization path. Gold’s history through these phases:

Gold as collectible (~3000 BCE to ~600 BCE)

Gold was valued for ornamentation, religious significance, and as a symbol of status. It was hoarded by elites, used in temples and royal regalia, and traded in small quantities. It was not yet meaningfully money. This phase lasted roughly 2,400 years.

Gold as store of value (~600 BCE to ~700 CE)

With the invention of coinage in Lydia (~600 BCE), gold began to function as standardized stored wealth. Roman aureii, Byzantine solidi, and other coins served as elite stores of value while everyday commerce ran on silver and copper. This phase lasted roughly 1,300 years.

Gold as medium of exchange (~700 CE to ~1900 CE)

In the medieval and early modern periods, gold coins (florin, ducat, sovereign) became widely used in trade, especially international and large-value trade. Silver remained the everyday medium for smaller transactions. This phase lasted roughly 1,200 years.

Gold as unit of account (~1815 CE to ~1971 CE)

During the classical gold standard era (1815-1914) and the diluted Bretton Woods era (1944-1971), gold was the unit of account against which currencies were defined. National currencies were specific weights of gold. This was gold’s apex as money. This phase lasted only ~150 years.

Gold’s demonetization (1971 to present)

Since Nixon closed the gold window in 1971, gold has lost its unit-of-account function entirely, lost most of its medium-of-exchange function, and retains primarily its store-of-value function (and some collectible aspects). It has effectively reverted to Phase 2 — a remarkable demonstration that phases can be lost as well as gained.

What this teaches about Bitcoin

The gold timeline shows that monetization phases take a very long time historically — centuries or millennia. Bitcoin’s progression has been compressed by orders of magnitude. Bitcoin moved through its collectible phase in about 5 years (2009-2014) and is moving through the store-of-value phase over perhaps 15-25 years (2014-2030s).

The compression is driven by:

  • Digital networks accelerating information and adoption
  • Pre-existing monetary thinking (people already understand “scarce digital asset”)
  • Globalization meaning monetization can happen everywhere simultaneously
  • High-bandwidth communication accelerating the recognition of the thesis

If gold took ~5,000 years total to fully monetize, Bitcoin might do it in ~100. This is a remarkable acceleration but still represents a multi-generational project.

See: History of the gold standard, Origins of money.

The synthesis: what Menger, Szabo, and Ammous together establish

Drawing the three thinkers together:

From Menger: Money emerges from market discovery, not state decree. Salability is the property goods compete on. The highest-salability good wins.

From Szabo: The monetary instinct in humans is far older than economics typically recognizes. Collectibles served as proto-money for tens of thousands of years before agriculture or states. The store-of-value function preceded the medium-of-exchange function by enormous spans of time.

From Ammous: Salability across time (measured by stock-to-flow) is the master monetary property. The history of money is the history of higher-stock-to-flow assets displacing lower-stock-to-flow ones. Bitcoin is the apex of this evolution — the hardest money ever created.

The combined framework:

  1. Money emerges through market discovery (Menger)
  2. It emerges in phases, with store-of-value first (Szabo)
  3. The highest-stock-to-flow asset wins each phase transition (Ammous)
  4. Bitcoin is currently in the store-of-value phase of monetization (Boyapati’s synthesis)
  5. Each phase enables and overlaps with the next (the phase framework)

This synthesis explains:

  • Why Bitcoin behaves the way it does at this stage
  • Why the common criticisms miss the point
  • What we should expect in the coming decades
  • How Bitcoin compares to gold’s historical path
  • Why the phase order matters and cannot be reversed

This is one of the most powerful interpretive frameworks available. It connects deep monetary history to current Bitcoin dynamics to plausible future projections, all within a single coherent theoretical structure.

Counter-arguments and tensions

The phase framework faces both framework-internal and broader monetary-economic objections. Framework-internal objections are treated here; the major broader objections are in the Criticisms of Bitcoin section.

“The framework is too neat”: granted; it’s a model, not literal history. Captures the dominant logical-order pattern across many monetization cases without predicting every historical detail.

“Phase boundaries aren’t clean”: agreed; Bitcoin already overlaps into Phase 3 (cross-border payments, El Salvador, Lightning) while remaining dominantly Phase 2. The framework describes dominant phase, not exclusive phase.

“Bitcoin might fail before reaching later phases”: true; the framework describes successful-monetization patterns, not guarantees. Bitcoin could fail; the framework would remain valid.

“State action could prevent the MoE transition”: possible but historically unsuccessful; legal-tender laws have been undermined by every emerging monetary technology.

The two major broader critiques — that Bitcoin’s volatility prevents the unit-of-account function and that stablecoins are permanently capturing the MoE/UoA roles while Bitcoin holds only SoV — are treated substantively in Unit-of-account stability vs price volatility. The bifurcated-equilibrium scenario (Bitcoin SoV + stablecoin MoE/UoA) may be transitional or stable; the empirical trajectory will resolve over decades.

The broader “Bitcoin isn’t money” framing critique (Krugman, Roubini, Fama) is treated in The Ponzi and no-intrinsic-value critiques. The phase framework provides the structural Bitcoin-side response; critics rest on more conventional all-three-functions-required frameworks.

Open questions for further development

  • How fast can Bitcoin compress the timeline? Gold took 5,000 years; Bitcoin has accelerated dramatically. Are there fundamental limits to acceleration?
  • Will stablecoins permanently capture the medium-of-exchange function while Bitcoin holds the store-of-value role? Or will Bitcoin (via Lightning) eventually win both?
  • Does the phase framework apply when the asset is digital? Are there features unique to digital money that change the dynamics?
  • The unit-of-account transition has historically required state support (legal tender, government accounting). Can Bitcoin become a unit of account without state cooperation?
  • How does the framework apply to fractional Bitcoin holdings (most people own less than 1 BTC)? Does the phase framework still apply when units are denominated in satoshis?

Canonical sources for this note

Foundational

  • On the Origins of Money, Carl Menger (1892) — the foundational text on monetization
  • Shelling Out: The Origins of Money, Nick Szabo (2002) — the deep-history extension
  • Principles of Economics, Carl Menger (1871) — broader context for the salability framework

Modern synthesis

  • The Bullish Case for Bitcoin, Vijay Boyapati (2018 essay, 2021 book) — the clearest modern statement of the phase framework
  • The Bitcoin Standard, Saifedean Ammous (2018) — the comprehensive Austrian-Bitcoin synthesis
  • The Fiat Standard, Saifedean Ammous (2021) — applied to the failure modes of fiat
  • Broken Money, Lyn Alden (2023) — accessible modern treatment
  • Layered Money, Nik Bhatia (2021) — useful framework for monetary layers

Related Austrian foundations

  • The Theory of Money and Credit, Ludwig von Mises (1912) — the regression theorem extends Menger’s framework
  • What Has Government Done to Our Money?, Murray Rothbard (1963) — the moral and historical case

Adoption and price dynamics

  • The Speculative Bitcoin Adoption/Price Theory, Michael Casey — on Gartner hype cycles applied to Bitcoin monetization
  • Various works on the S-curve of adoption for transformative technologies

For deep history

  • Sapiens, Yuval Noah Harari — context on early human cooperation
  • Various anthropological works on the Kula ring, wampum, and other primitive monies
  • Archaeological literature on Blombos Cave beads and other early collectibles

For empirical tracking of Bitcoin’s monetization

  • Glassnode and other on-chain analytics — for tracking holder behavior across phases
  • Various long-term price models (Power Law, Stock-to-Flow, etc.) — different frameworks for modeling the monetization trajectory
  • Lightning Network statistics — for tracking Phase 3 emergence

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