The dollar system and exorbitant privilege

The phrase "exorbitant privilege" belongs to Valéry Giscard d'Estaing, who used it as French finance minister in the 1960s to describe what the United States gained from issuing the currency everyone else needed to hold. It is routinely misattributed to de Gaulle, who made the political argument while Giscard supplied the label. The complaint was concrete: the United States could settle its external deficits by printing liabilities that foreigners were obliged to accept, while every other country had to earn dollars first.

Sixty years later the arrangement is still standing, and the privilege is both smaller and stranger than the phrase suggests. It is smaller because the United States does not, in fact, borrow for free. It is stranger because the privilege comes bundled with an obligation that shows up precisely when the world is in trouble. Understanding the mechanism matters for anyone holding foreign assets, because the dollar is not merely one currency among many. It is the pricing unit, the funding unit and the collateral of the global financial system, and its movements propagate into everything else.

What the dollar system actually consists of

Four distinct functions get compressed into the word "reserve currency", and they are worth separating.

Invoicing. Most internationally traded goods are priced in dollars, including nearly all oil, most other commodities, and a large share of manufactured trade that never touches the United States. Gopinath and co-authors call this the dominant currency paradigm, and its consequence is important: a country's import prices respond to the dollar exchange rate rather than to its bilateral rate with its actual trading partner. When the dollar strengthens, Brazilian imports from Korea get more expensive in Brazil even though no American is involved.

Funding. Borrowers outside the United States issue dollar debt because that is where the deepest pool of lenders sits. This creates a large stock of dollar liabilities held by entities whose revenues are in other currencies. The stock of dollar credit to non-bank borrowers outside the United States, tracked by the BIS, runs into the trillions.

Reserves. Central banks hold roughly three-fifths of their allocated foreign exchange reserves in dollars according to the IMF's COFER data, down from something closer to seven-tenths at the start of the 2000s, and that drift has gone mainly into a scattering of smaller currencies rather than into a single rival.

Market plumbing. The dollar sits on one side of close to 90% of all foreign exchange transactions, per the BIS Triennial Survey. Because each trade has two currencies, the shares sum to 200%, which is why that figure can look impossibly large at first reading. The practical meaning is that converting almost any currency into almost any other is cheapest through a dollar leg.

These functions reinforce each other. You invoice in dollars because your competitors do, you borrow in dollars because your revenues are dollar-linked, and central banks hold dollars because that is what their firms owe. Network effects of this kind are why incumbency in monetary systems is measured in decades.

The privilege, priced

The most durable measurement of the privilege is not the interest rate on Treasury bills. It is the return differential: the United States earns more on what it owns abroad than it pays on what foreigners own in the United States, because it holds foreign equity and direct investment while issuing safe, liquid, low-yielding debt. Gourinchas and Rey described this as the transformation of the United States from world banker into world venture capitalist.

The arithmetic is easy to make concrete. Suppose a country holds gross foreign assets of USD 30 trillion earning 5%, and foreigners hold gross claims on it of USD 50 trillion earning 3%. Its net international investment position is negative USD 20 trillion. Yet its net investment income is 30 × 0.05 = USD 1.5 trillion received against 50 × 0.03 = USD 1.5 trillion paid, so net income is exactly zero. A net debtor of USD 20 trillion pays nothing to service it. Those numbers are illustrative, but the sign and the rough magnitude of the gap they describe are what the empirical literature finds.

Now add the valuation channel. Suppose USD 25 trillion of the USD 30 trillion in foreign assets is denominated in foreign currency, while essentially all of the USD 50 trillion of liabilities is denominated in dollars. A 10% depreciation of the dollar raises the dollar value of those foreign-currency assets by 25 × 0.10 = USD 2.5 trillion and leaves liabilities unchanged. Net external wealth improves by USD 2.5 trillion without a single transaction. This is the real privilege: the issuer's external balance sheet adjusts through prices rather than through austerity.

The duty attached to the privilege

The same balance sheet structure runs in reverse during a crisis. Holding equity and direct investment abroad while owing safe debt at home means that when global asset prices fall and the dollar rallies, the United States loses on its assets and gains nothing on its liabilities. Gourinchas, Rey and Govillot labelled this the "exorbitant duty": the issuer of the world's safe asset is also the world's insurer of last resort, and the insurance pays out exactly when the rest of the world needs it.

There is an operational version of the same duty. Dollars are created not only by American banks but by banks everywhere, which take dollar deposits and make dollar loans without any access to the Federal Reserve. This offshore dollar system, historically called the eurodollar market, is enormous and structurally short of dollars in a run: its liabilities are dollars, its lender of last resort is not. That is why the Federal Reserve's standing swap lines with a small group of central banks, including the Swiss National Bank alongside the ECB, the Bank of Japan, the Bank of England and the Bank of Canada, are a piece of financial infrastructure rather than a diplomatic courtesy. Through them, a foreign central bank borrows dollars against its own currency and lends them onward to its domestic banks. Without that channel, a dollar funding squeeze abroad forces fire sales of dollar assets, which is a transmission belt straight into global prices.

How dollar moves become your returns

Because so much of the world borrows and invoices in dollars, the dollar exchange rate behaves like a global financial condition rather than a bilateral price. Hélène Rey's argument, that capital mobility leaves countries facing a dilemma rather than the textbook trilemma, rests on this: a global financial cycle driven substantially from the dollar and from US monetary policy constrains everyone, floating exchange rate or not.

The mechanism runs as follows. A stronger dollar raises the local-currency burden of dollar debt for borrowers whose revenues are local. Their creditworthiness deteriorates, so lenders reduce exposure, so credit tightens, so investment falls. At the same time, dollar-priced commodities tend to fall when the dollar rises, compressing the export revenues of commodity producers. Emerging-market equities, emerging-market local-currency bonds and industrial commodities therefore tend to move together against the dollar, and they do so for a reason that has nothing to do with sentiment.

For a portfolio, the practical consequence is that "dollar exposure" is not confined to dollar-denominated holdings. An unhedged position in an emerging-market equity fund carries a dollar factor loading even though it is priced in local currency, because the underlying companies' financing conditions depend on it.

The Swiss position inside the dollar system

Switzerland sits in an unusual spot: a small open economy with an internationally active banking sector whose dollar balance sheet is large relative to the domestic economy. Swiss banks intermediate dollars they do not create, funding dollar assets with wholesale dollar liabilities and with foreign exchange swaps. That makes the SNB's inclusion in the Federal Reserve's standing swap network materially important to Swiss financial stability, not a formality.

For a Swiss investor, the dollar shows up twice. It shows up directly, through the large weight of US assets in any global portfolio, and it shows up indirectly through the cross-currency basis: the deviation from covered interest parity that makes hedging dollars back into francs cost slightly more or less than the pure interest rate differential. The basis widens in stress, precisely when hedges are being rolled, which means the cost of protection rises at the moment it is most wanted. Anyone running a systematically hedged foreign bond allocation in francs should treat the basis as a real line item rather than a rounding error.

The franc's own international role, small but real, is the subject of the next lesson, which takes up how reserve status is won and lost more generally. The point to carry forward from here is that the dollar system is held together by network effects in four separate functions, and that a challenger has to displace the incumbent in most of them at once, not in one of them at a time.

What to take away

• "Exorbitant privilege" is Giscard d'Estaing's phrase, not de Gaulle's, and it describes a return differential and a valuation effect rather than a free lunch on interest rates.
• A net external debtor can pay zero net investment income if it holds high-yielding foreign assets against low-yielding domestic liabilities: 30 trillion at 5% exactly offsets 50 trillion at 3%.
• The same asymmetric balance sheet means the issuer of the world's safe asset transfers wealth abroad in a crisis, an obligation that comes bundled with the privilege.
• The offshore dollar system creates dollar liabilities outside the reach of the Federal Reserve, which is why central bank swap lines, including the SNB's, are core financial plumbing.
• Dollar strength is a global financial condition, so a portfolio can carry substantial dollar factor exposure through assets that are not denominated in dollars at all.

Sources

• Barry Eichengreen, Exorbitant Privilege: The Rise and Fall of the Dollar and the Future of the International Monetary System, Oxford University Press, 2011.
• Pierre-Olivier Gourinchas and Hélène Rey, "From World Banker to World Venture Capitalist: US External Adjustment and the Exorbitant Privilege", NBER, 2007.
• Pierre-Olivier Gourinchas, Hélène Rey and Nicolas Govillot, "Exorbitant Privilege and Exorbitant Duty", working paper, 2010.
• Gita Gopinath, Emine Boz, Camila Casas, Federico Díez, Pierre-Olivier Gourinchas and Mikkel Plagborg-Møller, "Dominant Currency Paradigm", American Economic Review, 2020.
• Hélène Rey, "Dilemma not Trilemma: The Global Financial Cycle and Monetary Policy Independence", Jackson Hole Economic Policy Symposium, 2013.
• Bank for International Settlements, Triennial Central Bank Survey of Foreign Exchange and OTC Derivatives Markets, and the BIS global liquidity indicators.
• International Monetary Fund, Currency Composition of Official Foreign Exchange Reserves (COFER) database.
• Federal Reserve, documentation of standing US dollar liquidity swap arrangements with the ECB, Bank of Japan, Bank of England, Bank of Canada and Swiss National Bank.