The Eurodollar system

The dollar system is much larger than the United States. Most dollars do not exist as paper bills, do not exist inside US bank accounts, and have never touched the Federal Reserve's balance sheet. They exist as bookkeeping entries at foreign banks — claims on dollars that the Fed neither created nor regulates. This parallel market has a name, even though almost no one outside of finance has ever heard it: the Eurodollar system. By any honest measure, it is bigger than the official US money supply. By some measures, it is several times bigger. And it is the actual mechanism through which the dollar functions as the world's reserve currency.

The story begins in the 1950s. Soviet banks earned dollars from selling oil and gold to Western buyers but refused to deposit those dollars in New York, where the US Treasury could freeze them during a Cold War flare-up. They parked the money at European banks instead — most famously at Moscow Narodny Bank in London and at the Paris bank whose cable address, "Eurobank," gave the market its name. London merchant banks, locked out of their traditional sterling-lending business by UK exchange controls, were happy to take the deposits and lend them out as dollars. A new market was born: dollar deposits, held outside the United States, lent and borrowed by non-US banks, governed by no central bank and no single regulator. By the early 1960s the market had a name and a price (LIBOR). By the late 1970s it had overtaken the entire US money supply.

The definition is simple. A Eurodollar is any US dollar held as a deposit liability at a bank outside the United States. The prefix "Euro-" is a historical artifact — these dollars are now held in Tokyo, Singapore, Hong Kong, Dubai, Sao Paulo, and Frankfurt, not just London. The defining feature is jurisdiction. A dollar in a Chase account in Manhattan is a deposit liability of a US bank, subject to Fed reserve requirements and FDIC oversight. The same dollar wired to an HSBC London account becomes a deposit liability of a non-US bank, subject to no Fed reserve requirement, no FDIC insurance, and no direct US regulatory reach. HSBC can lend that dollar to another foreign bank, which can lend it again, and again. The same underlying US bank reserve produces a cascade of independent dollar claims — fractional reserve banking, without any of the constraints the Fed places on the system it does control.

The size is genuinely difficult to measure, and that itself is part of the story. The Bank for International Settlements tracks cross-border dollar claims by reporting banks and puts the number around $13 trillion. Researchers who include offshore dollar bonds, shadow banking liabilities, and dollar-denominated derivative positions estimate $20 to $30 trillion. By comparison, US M2 — the official US broad money supply — is about $21 trillion, and the Federal Reserve's monetary base is only about $5 trillion. Whichever estimate you accept, the offshore market is comparable to or larger than the entire onshore one. And nobody knows the exact figure because the market is, by design, opaque. It is regulated nowhere and recorded inconsistently. The most powerful market in the world is also the most poorly measured.

This produces a curious institutional fact. The Federal Reserve is not the global central bank for dollars. It is something stranger: the lender of last resort to a system it does not regulate, observe in real time, or fully understand. When the Eurodollar market seizes — when foreign banks suddenly become unwilling to lend dollars to other foreign banks — the Fed has no choice but to extend dollar swap lines to foreign central banks, who re-lend the dollars to their own banks. In 2008 the Fed extended these lines to fourteen central banks and saw drawn balances peak around $580 billion. In 2020 it did the same, with peaks near $450 billion. Without these interventions, defaults on dollar liabilities outside the United States would have cascaded back into the US financial system and produced collapses an order of magnitude larger than the ones that actually occurred. The Fed knows this. The Treasury knows this. The voting public, mostly, does not.

This is why "the 2008 crisis" is misunderstood by almost everyone. The story most people learned is a US story — predatory mortgages, leveraged Wall Street banks, a housing bubble. All of that was real and all of that mattered. But the mechanism that turned a serious recession into a global financial heart attack was a sudden offshore dollar shortage. European banks held roughly $2 to $4 trillion in dollar-denominated assets funded by short-term Eurodollar borrowing. When that funding seized, they could not roll it over. They could not manufacture dollars themselves. They began dumping dollar assets to raise cash, which crashed prices further, which deepened the funding crisis, which forced more selling. The Fed's swap lines were not a courtesy — they were the only thing standing between the offshore dollar market and a chain of defaults that would have made Lehman look small.

The same architecture explains why financial sanctions are so powerful. Sanctions work because dollars settle through US correspondent banks. Any cross-border dollar transaction eventually touches a US bank, which is subject to US law. A foreign bank that wants to maintain dollar access — meaning a foreign bank that wants to do international business at all — must comply with US sanctions policy or face exclusion. This gives the Treasury Department, through OFAC, more day-to-day jurisdictional reach over global commerce than any military. It is also exactly why sanctions accelerate the search for alternatives. Every time the dollar is used as a weapon, every other central bank in the world learns that their access to dollars is politically contingent. The freezing of $300 billion of Russian central bank reserves in 2022 was operationally successful and strategically expensive: it taught every non-aligned reserve manager why they need a non-dollar settlement option. CIPS, mBridge, bilateral CBDC pilots, record central bank gold purchases — these are not ideological projects. They are rational hedges against a system whose access can be revoked.

The deepest implication is the one hardest to absorb: nobody actually controls global dollar liquidity. Not the Fed, not the Treasury, not Congress, not any committee or council. The Fed sets a policy rate and operates open market operations on a small base layer. The vast majority of dollar money creation happens through lending decisions by thousands of non-US commercial banks, in jurisdictions that report to no single regulator, priced in markets where the Fed has no direct visibility. When the system works, it looks like the Fed is in charge. When the system breaks, it becomes clear that the Fed is improvising — extending swap lines, inventing repo facilities, backstopping markets it does not regulate — because the alternative is collapse. The global financial system has no driver. There is only the firefighter who shows up when it catches fire.