Latest / Monetary Policy Explained with Fexingo: Central Banks, Money Supply, and Interest Rates / How Central Banks Wield Emergency Lending Powers
Transcript
- Lucas: If you run a bank and suddenly every depositor wants their money back on the same day, you have a problem. And if that problem spreads to a dozen other banks, you have a financial crisis. That's where the central bank steps in as what's called the lender of last resort. Luna: It sounds dramatic — like a firefighter showing up when everything's already burning. But how does that actually work in practice? Lucas: The classic tool is the discount window. It's a facility at the Federal Reserve where banks can borrow reserves overnight, typically at a penalty rate above the federal funds rate. The idea is straightforward: if you're a solvent bank with a temporary liquidity crunch, the Fed lends you cash against good collateral. You survive the run, and the system stays stable. Luna: So the discount window has been around forever. But I remember reading that during the 2008 crisis, banks were terrified to use it. Why? Lucas: Because of stigma. If your competitors or the market find out you're borrowing from the discount window, it signals weakness. It's like admitting you can't get funding anywhere else. So banks would rather sell assets at fire-sale prices or even fail than tap the window. In 2008, the Fed had to create emergency facilities like the Term Auction Facility to let banks borrow anonymously. Luna: Right, because anonymity matters. So the discount window is technically always there, but it's psychologically off-limits during a crisis unless everyone's using it. Lucas: Exactly. And that's why the Fed spent years after 2008 trying to reduce the stigma. They made discount window borrowing less punitive, they encouraged banks to test access, they published guidance. But by March 2023, when Silicon Valley Bank collapsed, the stigma was still very much alive. Luna: SVB is a perfect case study. They had huge unrealised losses on Treasury bonds because rates had risen. Depositors ran. The bank couldn't sell bonds fast enough without realising those losses. So why didn't they just go to the discount window? Lucas: They actually did try. SVB had pledged collateral to the Federal Home Loan Bank first, which is a common first step. But by the time they needed more, the run was too fast. And the discount window would have required them to post additional collateral — government bonds — that they were already using elsewhere. Plus, the amount they needed was enormous. So the classic lender of last resort tool failed because it wasn't designed for a run that unfolds in hours, not days. Luna: And that's where the Fed created something new — the Bank Term Funding Program, or BTFP. Lucas: Right. The BTFP was announced on March 12, 2023, the Sunday after SVB failed. It let banks borrow from the Fed for up to one year, and here's the key: they could pledge Treasury bonds and mortgage-backed securities at par value, not at market value. If a bank had a bond purchased at $100 that was now worth $85 because rates went up, the Fed would still lend $100 against it. That solved the unrealised-loss problem instantly. Luna: So effectively, the Fed ignored the losses. That's a huge departure from normal discount window lending, where they'd haircut the collateral based on market value. Lucas: Massive departure. And it worked. Over the next few weeks, banks borrowed about $150 billion from the BTFP. It stopped a potential contagion. But it also created a moral hazard question: if the Fed will always backstop bond losses, why should banks hedge interest rate risk? Luna: That's the classic central bank dilemma. You want to prevent panic, but you don't want to encourage reckless behavior. How do central banks balance that? Lucas: They use what economists call constructive ambiguity. Don't pre-commit to bailing anyone out. But when the moment comes, do whatever it takes — within reason. Walter Bagehot, the 19th-century economist who first formalised the lender of last resort idea, said: lend freely at a penalty rate against good collateral. The penalty rate discourages borrowing unless it's an emergency, and good collateral ensures the central bank doesn't take losses. Luna: But the BTFP broke Bagehot's rule. It lent at par, not at a penalty rate, and it accepted collateral that was clearly impaired. Lucas: It did. And that's the lesson of 2023: Bagehot's rules are a good starting point, but in a modern run driven by social media and instant withdrawals, you need more aggressive tools. The BTFP was essentially a bridge to let banks manage their liquidity while the system stabilised. It closed for new loans in March 2024, but it showed that the lender of last resort function has to evolve. Luna: So if walking through the economy with us has made something click, this might be a good moment to mention that we deliberately don't run ads on these episodes. If you want to support that choice, the link is buy me a coffee dot com slash fexingo. Lucas: Yeah, it's a small thing, but it keeps the conversation clean. No sponsors, no product pitches — just the economics. Luna: Right. So back to the lender of last resort question — does the Fed still use the discount window at all, or is it now replaced by these emergency programs? Lucas: The discount window is still the primary standing facility. The BTFP was temporary. But the Fed also modernised the discount window after 2023. It reduced the spread over the federal funds rate, made borrowing terms more flexible, and encouraged banks to pre-position collateral so they can borrow instantly. In a sense, they're trying to make the discount window look more like the BTFP in normal times. Luna: So the stigma is still there, but they're chipping away at it. Lucas: Exactly. And other central banks have similar structures. The European Central Bank has its Marginal Lending Facility. The Bank of England has the Operational Standing Facility. They all serve the same purpose: ensure that a solvent bank never fails because it can't get cash. But the details — collateral, rate, duration — vary, and those details determine whether the facility actually gets used in a crisis. Luna: Let's talk about one more case: the 2020 dash for dollars. In March 2020, when COVID hit, there was a massive scramble for U.S. dollars globally. The Fed set up swap lines with other central banks to provide dollar liquidity. Is that also a lender of last resort function? Lucas: It is, but for the global system. The Fed acts as the lender of last resort to the world because the dollar is the dominant reserve currency. When foreign banks need dollars and can't get them, they turn to their own central bank, which then swaps local currency for dollars with the Fed. That's what happened in 2020: the Fed reactivated swap lines with 14 central banks, and they lent about $450 billion at the peak. Luna: So there's a domestic version and an international version. And both rely on the central bank's ability to create money out of thin air. Lucas: That's the ultimate power. A central bank can always lend reserves because it creates them. It's not like a commercial bank that has to attract deposits. So in a crisis, the central bank is the only institution that can provide unlimited liquidity. The challenge is to do so without undermining long-term incentives. Luna: Which brings us back to moral hazard. If banks know the central bank will always rescue them, won't they take more risk? Lucas: There's evidence that they do. A 2019 study by the IMF found that banks with access to central bank liquidity facilities tend to hold less capital. But the alternative — letting a solvent bank fail because of a liquidity problem — is worse. The key is to make sure the lending is priced to penalise risky behavior, and that failing banks are resolved, not kept alive indefinitely. Luna: So the lender of last resort is a powerful tool, but it has to be used sparingly and with clear rules. Lucas: Exactly. Bagehot's framework — lend freely, at a penalty rate, against good collateral — is still the gold standard. The BTFP bent the rules, but it did so temporarily and with an exit plan. And the discount window remains the everyday version of that same idea. The next time you hear about a bank tapping the discount window, don't assume it's a sign of weakness. It might just mean the system is working. Luna: And if you want to keep digging into how these tools work, you know where to find us. Lucas: Yeah. Next time, we'll look at how central banks manage the transition from crisis lending back to normal operations — the exit. That's a whole other puzzle.