Latest / Monetary Policy Explained with Fexingo: Central Banks, Money Supply, and Interest Rates / How Central Banks Use Currency Swap Lines
Transcript
- Lucas: It's June 2026, and if you look at the headlines from the last few weeks, there's a quiet but important story in central banking: the Federal Reserve's currency swap lines. These are arrangements where the Fed lends dollars to other central banks in exchange for their local currency, and they've become a backbone of global financial stability. Luna: Swap lines. They sound technical, but they basically solved a huge problem during COVID. I remember seeing that the Fed activated lines with 14 central banks in March 2020. That was massive. Lucas: Exactly. And it's worth unpacking why that mattered. When the pandemic hit, there was a sudden, violent scramble for U.S. dollars. Companies, banks, even governments outside the U.S. need dollars to settle international trade, pay dollar-denominated debt, and hedge currency risk. Luna: So when everyone wants dollars at the same time, the price of borrowing them — the dollar funding rate — spikes. And that can paralyze global trade. Lucas: Right. And the problem is, foreign central banks can't just print dollars. They can print their own currency. So the Fed steps in with a swap line: the Bank of Korea, for example, sends won to the Fed, and the Fed sends an equivalent amount of dollars — at a pre-agreed exchange rate — plus a small fee. Lucas: Those dollars then go to Korean banks, which use them to fund trade and pay off dollar debts. The whole system gets a lifeline. And the key is it's a swap, not a bailout — the Fed gets its dollars back when the swap matures, plus interest. Luna: So it's essentially a collateralized loan, but structured as a currency exchange. And the Fed doesn't take credit risk on foreign banks — it takes risk on the foreign central bank. Lucas: If today's episode is making something click, that's exactly why we love doing this. And the way we keep these conversations ad-free and independent is listener support. If you find value in it, you can head to buy me a coffee dot com slash fexingo. It's a small gesture that makes a big difference for us. Luna: And honestly, it helps us dive into these deeper topics without worrying about sponsors. So if you've ever gotten something useful out of an episode, that's the place. Lucas: Alright, back to swap lines. The 2020 activation wasn't the first time the Fed used them — they were crucial in 2008 during the financial crisis too. But what changed after COVID was the shift from ad-hoc, crisis-only lines to more permanent standing facilities. Luna: Right. In 2021, the Fed made swap lines with the Bank of Canada, the Bank of England, the Bank of Japan, the European Central Bank, and the Swiss National Bank into standing arrangements. No expiration date. Lucas: And they also created a new facility — the Foreign and International Monetary Authorities repo facility, or FIMA repo — which lets central banks that don't have swap lines borrow dollars by pledging U.S. Treasury securities as collateral. So it's a broader safety net. Luna: That's interesting — because not every central bank qualifies for a swap line. The FIMA repo gives them a way to access dollars without needing a pre-existing relationship. It's like the Fed opened a discount window for foreign central banks. Lucas: Exactly. And the scale was enormous. At the peak of COVID, outstanding swap drawings hit nearly $450 billion. That's a huge injection of dollar liquidity into the global system. Luna: So who actually used these lines? I know the European Central Bank and the Bank of Japan took large amounts. But there were also smaller central banks, like the Reserve Bank of Australia and the Riksbank. Lucas: The Riksbank is a great example. Sweden's central bank drew $500 million in swap lines in March 2020. That might sound small next to the ECB's $200 billion, but for a small open economy like Sweden, it was crucial for their banks' dollar funding. Lucas: And there's a stigma issue. Some central banks were hesitant to use swap lines because they worried it would signal weakness — that they couldn't manage their own currency. The Fed and other central banks actually had to publicly encourage them to draw. Luna: That stigma is real. In 2008, the Bank of Korea initially avoided drawing on its swap line for fear of looking like it was in trouble. But eventually it did, and it helped stabilize Korean won-dollar markets. Lucas: And that's the paradox: the lines are most effective when they're used, but using them can be seen as an admission of problems. That's why the Fed's shift to standing facilities matters — it normalizes the tool. Luna: So when a central bank has a standing swap line, drawing on it becomes routine, not a crisis signal. Like how the ECB and Fed swap daily as part of normal liquidity management. Lucas: Exactly. And it's not just the Fed. Other central banks have their own swap networks. The People's Bank of China has bilateral swap lines with over 30 countries, mostly in renminbi. But the dollar swap network is the largest by far. Luna: Which raises a question: does this entrench the dollar's dominance? If every central bank can get dollars easily, it reinforces the dollar's role as the global reserve currency. Lucas: That's a fair point. Some economists argue that swap lines are a form of dollar hegemony — they lock in the U.S. as the global lender of last resort. But others say it's a necessary public good. Markets need a backstop, and the Fed is the only institution that can provide it at scale. Luna: And it's not just about crisis response. These lines also help with normal liquidity management. For example, the Bank of Japan regularly uses its swap line to provide dollar funding to Japanese banks that need to settle international transactions. Lucas: Right. So swap lines have become a part of the plumbing of global finance. They're not just emergency tools — they're used in everyday operations. And that's a big shift from the ad-hoc approach of the 2008 era. Luna: Let's talk about pricing. How does the Fed decide the interest rate on these swaps? Is it just the Fed funds rate plus some spread? Lucas: Essentially. The interest rate on a swap drawing is set at the overnight indexed swap rate — which is very close to the Fed funds rate — plus a spread of 50 basis points. For the FIMA repo, it's a bit higher, around 25 basis points above the IOER rate. Luna: So it's not a subsidy. It's priced to be attractive enough to use but not so cheap that it distorts markets. The idea is to provide a backstop, not a permanent funding source. Lucas: Exactly. And there's a maturity structure — typically one-week drawings, but they can be extended. During COVID, the Fed offered 84-day swaps to give central banks more flexibility. Lucas: One thing people don't always realize is that swap lines can also be used to inject dollars into foreign economies without affecting the Fed's balance sheet. When the swap matures, the dollars come back and the foreign currency is returned. It's neutral over time. Luna: Unless the other central bank defaults on the swap. But that's essentially impossible because it's a central bank to central bank transaction with a sovereign counterparty. Lucas: Right. The credit risk is considered negligible. That's why the Fed can do these swaps at scale without worrying about losses. And in practice, no central bank has ever defaulted on a swap line. Luna: So if the risk is so low, why not make swap lines available to every central bank? Why limit it to just a few? Lucas: That's a great question. The Fed has historically been selective because it wants counterparties with strong institutional frameworks, transparent operations, and no history of currency manipulation. There's also a political dimension — Congress and the Treasury have to sign off. Luna: And the FIMA repo is the safety valve for those who don't qualify. It's not as generous — the rate is a bit higher, and you need to have U.S. Treasury collateral — but it's a door. Lucas: Exactly. So the system has layers: standing swap lines for the core central banks, temporary lines for others during crises, and the FIMA repo for the rest. And all of it is designed to prevent dollar funding freezes from cascading into global financial crises. Luna: Which is basically what happened in 2008 and 2020. Without swap lines, dollar shortages could have triggered a wave of defaults and trade disruptions. Lucas: Right. And looking ahead, there's a debate about whether these lines should be formalized further. Some economists argue for a permanent global swap network with the IMF as the coordinator. Others say the current ad-hoc system is fine because it's flexible. Luna: But there's also a risk of moral hazard. If banks know the Fed will backstop dollar funding, they might take on more dollar-denominated risk. That's a classic central banking dilemma. Lucas: It is. But the counterargument is that swap lines aren't a permanent subsidy — they're a liquidity tool, not a solvency tool. And the pricing and collateral requirements are designed to limit abuse. Lucas: So the next time you see a headline about the Fed activating swap lines, you'll know what's really happening: the world's central bank is acting as the global lender of last resort, one currency swap at a time. Luna: And it's one of those tools that works best when you don't notice it. If it's working well, nobody talks about it. But if it fails, that's when we get a crisis.