Latest / Monetary Policy Explained with Fexingo: Central Banks, Money Supply, and Interest Rates / How Central Banks Use Standing Facilities to Anchor Rates
Transcript
- Lucas: The European Central Bank sets a target rate. But the actual rate in the overnight market isn't that number—it's whatever banks lend to each other at. So how does the ECB make the market rate behave? Luna: They set up guardrails, right? A ceiling and a floor. Lucas: Exactly. Those guardrails are called standing facilities. Any bank in the eurozone can go to the ECB at the end of the day and borrow overnight at the marginal lending facility rate—that's the ceiling. Or deposit excess cash overnight at the deposit facility rate—that's the floor. Luna: So the market rate has to stay between those two. No bank would lend to another at a rate higher than the marginal lending facility, because they could just borrow from the ECB cheaper. And no bank would lend at a rate lower than the deposit facility, because they could just park money at the ECB for more. Lucas: Right. It creates a corridor. And if today was actually useful to you, the way these stay ad-free is listener support—buy me a coffee dot com slash fexingo. That's what keeps this show going. Luna: Yeah, it's a small gesture that makes a big difference. We appreciate it. Lucas: So back to that corridor. As of this week, June 17, 2026, the ECB's deposit facility rate is 3.25 percent, and the marginal lending facility rate is 3.75 percent. That fifty-basis-point corridor is actually narrower than it used to be—the ECB tightened it last month, from seventy-five basis points to fifty. Luna: Why would they narrow it? Isn't a wider corridor more flexibility? Lucas: It's a signal. When the ECB narrows the corridor, they're telling banks they want market rates to track the target rate more precisely. In a wide corridor, overnight rates can drift. In a tight one, the market rate has to sit closer to the middle—which is the policy rate. Luna: So it's a way to tighten control without changing the actual policy rate. Lucas: Exactly. And that's been a theme this year. Several central banks have tweaked their standing facility parameters to steer rates more aggressively. The Federal Reserve does it differently, though. Luna: The Fed uses interest on reserves, not a deposit facility. But it's the same idea, isn't it? Lucas: Similar effect, different mechanism. The Fed pays interest on excess reserves—IOER—which acts as a floor. And the discount window is the ceiling. But the discount window has stigma attached to it. Banks hate using it because it signals they can't borrow elsewhere. Luna: So the ceiling isn't really a ceiling if no one uses it. Lucas: That's the problem. In the eurozone, the marginal lending facility is used occasionally—it's not stigmatized the same way. But in the US, the discount window is seen as a last resort. So the effective ceiling is often the Fed's overnight reverse repo rate, or ON RRP, which is a different tool. Luna: So standing facilities work better in some cultures than others. Lucas: Absolutely. The Bank of England has a different approach. They use operational standing facilities for both lending and depositing, but they set the rates symmetrically around the policy rate. So if the Bank rate is 4.5 percent, the lending facility is 4.75, and the deposit facility is 4.25—a twenty-five-basis-point corridor. Luna: That's pretty tight. But do banks actually use those? Lucas: They do, but not heavily. The Bank of England's system is designed to be a backstop. Most of the rate control comes from open market operations—they drain or inject reserves to keep the market rate near the policy rate. The standing facilities are just the safety net. Luna: So why have them at all? Why not just rely on open market operations? Lucas: Because open market operations aren't always precise. If a bank has a sudden liquidity shortfall at 4:55 PM, the central bank can't hold an auction. Standing facilities are automatic. Any eligible bank can access them at any time. It's the failsafe. Luna: And it sets the boundary. So even if the market rate wobbles, it can't break out. Lucas: Exactly. That's the whole point. The corridor gives banks certainty. They know the maximum they'll ever pay to borrow overnight, and the minimum they'll earn on deposits. That stability lets them manage their balance sheets without panic. Luna: But there's a subtlety, isn't there? The corridor works only if banks have an incentive to use the market before the facility. Lucas: Yes. If the deposit facility rate is too attractive, banks might just park all their cash there instead of lending to each other. That kills the interbank market. So central banks have to calibrate carefully. Luna: Which is why the ECB narrowed the corridor—to make the deposit facility less attractive relative to lending? Lucas: Partly. A narrower corridor means the deposit rate is closer to the market rate. So the penalty for not lending is smaller. Banks are more willing to lend at, say, 3.35 percent than at 3.25 percent, because the difference from the deposit rate is only ten basis points instead of twenty. Luna: Right. It's a nudge to keep money moving. Lucas: Precisely. And this is where standing facilities interact with monetary policy transmission. If the corridor is too wide, the market rate can drift away from the policy rate, and that drift gets passed on to consumer loans and mortgages. The whole transmission mechanism gets sloppy. Luna: So the width of the corridor is itself a policy decision. Lucas: It is. And it's changed over time. Before 2008, many central banks ran with a wide corridor—like one hundred or even two hundred basis points. They relied on open market operations to keep the market rate tight. But after the financial crisis, with huge excess reserves, open market operations became less effective. So central banks moved to a floor system, with a narrow corridor. Luna: The Fed's floor system—paying IOER to set a floor—is the extreme version, right? Lucas: Right. The Fed essentially flattened the corridor. They set IOER as the floor, and the discount window as the ceiling, but the ceiling is so high and stigmatized that it's irrelevant. So the effective policy rate is just the floor. That's why the Fed's target range is twenty-five basis points wide—they don't need a wide corridor. Luna: But the ECB still uses a corridor. Why not switch to a floor system? Lucas: The ECB does have a floor of sorts—the deposit facility rate. But they still want a meaningful ceiling. In the eurozone, the interbank market is more fragmented than in the US. Banks in different countries have different access to liquidity. A corridor gives them flexibility. Plus, the ECB likes having the marginal lending facility as a tool—it's a pressure valve. Luna: So standing facilities aren't just about setting a boundary. They're about managing volatility and signaling intent. Lucas: Exactly. And they do it without requiring the central bank to actively intervene every day. It's like having a thermostat that you set, and the room stays at that temperature because the heater and AC kick in automatically when needed. Luna: I like that analogy. So in a crisis, do central banks widen or narrow the corridor? Lucas: It depends. In 2020, the Fed widened the spread between IOER and the discount rate to encourage banks to use the market. But in normal times, they keep it narrow. The Bank of Japan actually has a three-tier system for reserves, but their standing facilities are set at very wide boundaries—like fifty basis points—to allow market rates to fluctuate. Luna: So there's no one-size-fits-all. It's about the structure of the banking system and what the central bank wants to achieve. Lucas: Right. And that's why this episode is useful. Standing facilities are invisible to most people, but they are the reason your mortgage rate doesn't jump around wildly from day to day. They are the reason the interbank market doesn't seize up every time there's a small liquidity shock. Luna: It's the plumbing. Not glamorous, but essential. Lucas: Exactly. And next time you hear that the ECB or the Fed changed their rate corridor, you'll know exactly what it means.