The Legal Foundations of Money: Understanding Its Legitimation

We accept money every day without questioning why it works. A piece of paper – or more accurately, a digital number on a screen – is traded for food, rent, and services without hesitation. But what actually makes money money? The answer is not gold reserves or intrinsic value. It is law, state authority, and collective trust. The legitimation of money is fundamentally a legal and social process, and understanding it reveals a great deal about how modern societies are organized – and what is at stake as digital currencies challenge long-standing norms.

What distinguishes money from other forms of exchange 🔗

Not every object used in exchange qualifies as money. Barter involves direct trading of goods and services, where value is negotiated between parties each time. Money, by contrast, functions as a generalized medium – accepted not because of what it is, but because of what it represents. The sociologist Georg Simmel, in his foundational work The Philosophy of Money (1900), described money as a “claim upon society” – a token of mutual obligation embedded in social relations rather than tied to any physical substance. For Simmel, money’s power comes from trust, not material worth.

What separates money from other exchange instruments is that it carries three functions simultaneously: it is a medium of exchange, a unit of account, and a store of value. Personal checks, gift cards, or bartered goods might occasionally serve one or two of these roles, but forms of payment like personal checks or credit cards are not considered legal tender because their acceptance depends on agreement between specific parties, not on legal mandate. Money, in its fully legitimized form, is accepted universally within a given society – not by choice, but by law.

The concept of legal tender 🔗

The legal backbone of money’s legitimacy is the concept of legal tender. Legal tender is money that is legally valid for the payment of debts and that must be accepted for that purpose when offered. This seemingly simple definition carries enormous sociological weight. It means that a creditor cannot legally refuse payment made in the designated currency – the state compels acceptance.

In the United States, U.S. coins and currency, including Federal Reserve notes and circulating notes of Federal Reserve Banks and national banks, are legal tender for all debts, public charges, taxes, and dues. This is codified directly in federal law under 31 U.S.C. § 5103. Importantly, the Federal Reserve clarifies that this statute means all identified U.S. money constitutes a valid and legal offer of payment for debts when tendered to a creditor – though private businesses, when selling goods or services (rather than collecting debts), are not always obligated to accept cash.

The constitutional foundations of this power run deep. In the landmark 1884 Supreme Court case Juilliard v. Greenman, the Court ruled that Congress had the right to issue notes as legal tender for both public and private debt. The ruling confirmed that the power to impress legal tender status on currency is a sovereign power – one that has been universally understood to belong to governments in both Europe and America since before the U.S. Constitution was framed. Under the U.S. Constitution, this power is reserved exclusively for the federal government; states are explicitly forbidden from coining money or making anything but gold and silver coin a tender in payment of debts.

How government endorsement confers legitimacy 🔗

Legal tender status is not simply a technicality – it is the mechanism through which the state transforms an otherwise arbitrary object into a socially recognized currency. Without government endorsement, money would be, in a practical sense, nothing more than paper or a digital entry that people could choose to ignore. Government backing creates the enforceability that makes money universal within a given economy.

This endorsement operates through several interlocking channels. First, the state designates a specific currency as the only legally recognized medium for discharging debts – giving it mandatory acceptance. Second, monetary policy, central bank regulation, and fiscal authority all reinforce confidence in the currency’s stability. Third, the state itself uses its own currency for taxation and public expenditure, creating constant demand for it. As Simmel’s analysis suggests, the monetary system must be underpinned by trust – not merely between individual transacting parties, but between individuals and the broader society that the state represents.

Sociologist Geoffrey Ingham further developed this line of thought, arguing that money is itself a social relation – one that requires an institutional framework to function. Money does not exist independently of the social and legal structures that give it meaning. When those structures collapse, so does the currency. The historical examples are instructive: Confederate currency became worthless after the Civil War because the political authority issuing it ceased to exist. The “Swiss” dinar, which ceased to be legal tender in Iraq, still circulated for over a decade in Kurdish regions – demonstrating that social trust can briefly outlast legal status, but not indefinitely.

Money as a social institution, not just an economic tool 🔗

From a sociological standpoint, the legitimation of money is about more than law – it is about collective belief. Simmel’s insight that money functions as a social nexus between strangers highlights this: money works precisely because it allows people who do not know or trust each other personally to transact. The law creates the framework; social trust sustains it.

Max Weber’s concept of legitimate authority is also relevant here. For Weber, authority becomes legitimate when those subject to it believe it is rightful. The same logic applies to currency. People accept money not merely because they are legally required to, but because they believe others will accept it too. This circular logic – money is valuable because it is believed to be valuable – is held together by the legal architecture of legal tender. Remove the legal backing, and the belief system becomes precarious.

This is why hyperinflation events are so socially destabilizing. When a government loses control of monetary policy and prices spiral, the social contract embedded in currency collapses. People stop accepting the legal tender because the trust that underlies it has evaporated – even though the law technically still designates that currency as official. Legal status alone is insufficient; social faith in money operates through ethical trust, methodical confidence, and hierarchical credibility.

Digital money and the question of legitimation 🔗

The rise of digital currencies – from cryptocurrencies like Bitcoin to state-backed Central Bank Digital Currencies (CBDCs) – forces a rethinking of these legal foundations. The critical distinction lies in whether a digital currency carries state endorsement.

Cryptocurrency: legitimacy without legal sanction 🔗

Bitcoin and similar cryptocurrencies operate entirely outside the legal tender framework. Cryptocurrency has not become widely adopted for payments – its value is too volatile to serve as an effective medium of exchange, transaction costs are too high, and it is neither legal tender nor backed by the “full faith and credit” of a government. Without this legal anchor, cryptocurrencies function more as speculative investment assets than as genuine money in the sociological sense.

Globally, the regulatory landscape for cryptocurrency remains fragmented. Cryptocurrency is mostly legal in 45 nations, partially banned in 20, and generally banned in 10, according to the Atlantic Council’s analysis of 75 countries. The European Union’s Markets in Crypto-Assets (MiCA) regulation came into full effect on December 30, 2024, creating the world’s first comprehensive unified regulatory framework for crypto across all 27 member states. In the United States, the GENIUS Act, enacted in July 2025, established the first federal law specifically governing payment stablecoins, requiring reserve backing, monthly audits, and anti-money laundering compliance.

These regulatory moves are significant because they signal that governments are not content to let digital currencies exist outside the legitimation framework entirely. Regulation is, in effect, a partial form of state endorsement – though it stops short of granting legal tender status. Without U.S. leadership in cross-border payments innovation, other countries – including China – could fill the void, setting the standards for the next generation of global monetary infrastructure.

CBDCs: digital money with full state legitimation 🔗

Central Bank Digital Currencies represent an entirely different approach. CBDCs are issued by a central bank, with the same guarantees that back a nation’s paper currency – equivalent to cash and designed for everyday transactions. Unlike private cryptocurrencies, a CBDC carries the full legal and institutional authority of the state. It is, in essence, digital legal tender.

As of 2025, 137 countries and currency unions representing 98% of global GDP are exploring CBDCs, and 49 pilot projects are currently underway. Three countries – the Bahamas, Jamaica, and Nigeria – have fully launched CBDCs. Jamaica’s JAM-DEX is particularly notable as the first CBDC to be formally ratified as legal tender. China’s digital yuan remains the world’s largest CBDC pilot, having reached 7 trillion e-CNY in total transaction volume across 17 provincial regions by June 2024. India’s e-rupee is the second-largest pilot, with circulation rising sharply through 2025.

The U.S. stands as a notable outlier. President Trump issued an executive order prohibiting the establishment, issuance, circulation, and use of a U.S. CBDC, making the United States the only major economy to formally halt retail CBDC development. The Federal Reserve has consistently stated it would only proceed with a CBDC with an authorizing law from Congress, underscoring that even the digitization of money remains fundamentally a question of legal and democratic legitimation.

The enduring importance of legal foundations 🔗

What the comparison between cryptocurrencies and CBDCs makes clear is that the legal foundations of money are not a bureaucratic formality – they are the very source of money’s social power. A currency without legal sanction may circulate temporarily on the basis of collective belief, but it remains fragile. State endorsement transforms money from a social agreement into a legally enforceable institution.

This does not mean governments have unlimited power over what counts as money. Digital technologies are creating new forms of value and exchange that challenge state monopolies over currency. But the sociological lesson of money’s history is clear: the legitimation of money has always required an anchor in recognized authority – whether that was a monarch’s seal, a central bank’s guarantee, or a constitutional act of Congress. As Simmel observed over a century ago, money is ultimately a claim on society. The question today is: which society, backed by which authority, will define the money of the future?

What do you think? As digital currencies like Bitcoin operate across borders without any single government’s backing, can they ever achieve the same level of social legitimacy as state-issued money? And if governments begin issuing CBDCs as the primary form of legal tender, what does that mean for individual financial privacy and the balance of power between citizens and the state?

References

1. https://en.wikipedia.org/wiki/The_Philosophy_of_Money
2. https://lsd.law/define/legal-tender
3. https://www.merriam-webster.com/dictionary/legal%20tender
4. https://www.law.cornell.edu/uscode/text/31/5103
5. https://www.federalreserve.gov/faqs/currency_12772.htm
6. https://supreme.justia.com/cases/federal/us/110/421/
7. https://constitution.congress.gov/browse/essay/artI-S10-C1-3/ALDE_00001099/
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10. https://en.wikipedia.org/wiki/Legal_tender
11. http://duniayanu.blogspot.com/2019/02/the-social-theory-of-money.html
12. https://www.academia.edu/4330756/Money_cultures_after_Georg_Simmel_mobility_movement_and_identity
13. https://www.congress.gov/crs-product/IF11471
14. https://www.icij.org/investigations/coin-laundry/cryptocurrency-regulations-global-explainer/
15. https://www.umgc.edu/blog/cryptocurrency-regulation-laws
16. https://www.atlanticcouncil.org/blogs/new-atlanticist/four-questions-and-expert-answers-on-the-new-us-cryptocurrency-legislation/
17. https://www.mastercard.com/us/en/news-and-trends/stories/2025/central-bank-digital-currency-cbdc-vs-cryptocurrency.html
18. https://www.atlanticcouncil.org/cbdctracker/
19. https://www.mckinsey.com/featured-insights/mckinsey-explainers/what-is-central-bank-digital-currency-cbdc
20. https://www.federalreserve.gov/cbdc-faqs.htm