Latest / Monetary Policy Explained with Fexingo: Central Banks, Money Supply, and Interest Rates / How Central Banks Are Executing Quantitative Tightening
Transcript
- Lucas: Let's start with a number: from the peak in mid-2022 to right now, July 2026, the Federal Reserve has reduced its balance sheet by roughly one and a half trillion dollars. That's about the combined market cap of Meta and Tesla. Luna: And that's just the Fed. The ECB has been shrinking too, though they started later and are now moving faster. So what exactly is happening here? Lucas: Right, we're talking about quantitative tightening — the unwinding of the massive bond buying programs central banks used during the pandemic. The basic mechanism is simple: instead of reinvesting the proceeds when bonds mature, central banks let those securities roll off their balance sheet. No new money enters the system. Luna: So it's not like they're actively selling bonds into the market, at least not in most cases. The Fed has mostly used passive roll-off, though they did sell some mortgage-backed securities directly in a small program last year. Lucas: Exactly. Passive roll-off is the preferred tool because it's less disruptive. But the pace matters — the Fed initially caps how much can roll off each month: originally ninety-five billion per month at the peak, then reduced to sixty billion in mid-2024. That cap determines how fast reserves drain from the banking system. Luna: And reserves are the key plumbing here. When the Fed lets a Treasury bond mature, the Treasury's account at the Fed is debited, and the private sector's reserves shrink by the same amount. Less reserves means the banking system has less cushion for day-to-day payments. Lucas: Which is why central banks are watching money market rates like a hawk. The effective federal funds rate and the secured overnight financing rate, SOFR, can spike if reserves get too scarce. We saw that happen in September 2019 during the repo market blow-up. Luna: So the question is: how much is too much? There's no hard number, but the Fed has estimated that reserve scarcity might kick in around two and a half to three trillion dollars of aggregate reserves. Right now they're just above that zone. Lucas: That's why the Fed slowed the pace of tightening last year — to avoid an accidental liquidity crunch. Now let's compare to the ECB. They started QT in 2023, but they're doing it differently. For one, they have a larger proportion of longer-term bonds, and they've been more aggressive recently. Luna: Yeah, the ECB announced an acceleration in early 2025. They're now reducing their holdings by about thirty billion euros per month, and they've also started to phase out the pandemic-era TLTRO loans. That's another way to shrink the balance sheet — letting cheap bank loans mature. Lucas: And then there's the Bank of Japan. They're in a completely different position. For years they've been the outlier, still expanding their balance sheet even as others tighten. But even the BOJ began a very gradual tapering last year. Their yield curve control ended officially in March 2024. Luna: So what does all this mean for the typical investor or business owner? It means the era of cheap money and massive central bank support is definitively over. QT reduces the stock of liquidity, which tends to push up long-term rates, tighten financial conditions, and reduce the appeal of riskier assets. Lucas: And that's the main transmission channel. QT works through the term premium — the extra compensation investors demand for holding long-term bonds. When the Fed is no longer a buyer, the private sector has to absorb more supply, so yields generally rise. That feeds into mortgage rates, corporate borrowing costs, even sovereign debt. Luna: But there's a twist: some economists argue that QT has a smaller effect now because markets have priced it in. The initial announcement back in 2022 caused a big sell-off, but since then, the actual runoff has been relatively orderly. Lucas: Look, if walking through the economy with us has made something click, you can support the show. It's buy me a coffee dot com slash fexingo. No pressure, just a way to keep the podcast ad-free and focused on the economics. Luna: Honestly, even a symbolic coffee helps us know people are listening. That link again: buy me a coffee dot com slash fexingo. All lowercase, one word. Lucas: Alright, back to the plumbing. One nuance we haven't touched on is the distribution of reserves. Not all banks have the same amount. The big money center banks tend to hold a lot, but regional banks often have less. So even if aggregate reserves are adequate, there can be pockets of scarcity. Luna: That's exactly what the Fed's overnight reverse repo facility, the ON RRP, was designed to smooth out. When that facility had a lot of cash parked at the Fed, it acted as a buffer. As reserves drop, that buffer shrinks. Right now, the ON RRP is down to almost nothing — about fifty billion — from a peak of over two trillion in 2021. Lucas: That depletion is actually a sign that QT is working. Money market funds have moved their cash into Treasury bills rather than leaving it at the Fed, which pushes short-term rates up. The next stress point might come when the Treasury issues a lot of new debt quickly, as it often does around tax deadlines. Luna: So central banks have to be nimble. The Fed has already created a standing repo facility — the Standing Repo Facility — which allows banks to borrow reserves overnight against Treasury collateral at a penalty rate. That's like a safety valve if rates spike. Lucas: Right, and the facility is set at the IOER rate plus twenty-five basis points. So the market knows there's a ceiling. That gives the Fed confidence to continue QT without fear of a 2019-style meltdown. Luna: But what about the international dimension? Dollar swap lines aren't just for emergencies anymore—they're a standing tool. If QT in the US causes dollar scarcity globally, the Fed can inject dollars through swap lines with other central banks. Lucas: That's a good point. The swap network has been made permanent. So even as the Fed shrinks its balance sheet, it has the tools to address funding stress abroad. That's a big difference from the 2018–2019 taper tantrum when those facilities were ad hoc. Luna: And the ECB has its own set of tools, like the new transmission protection instrument, TPI, which allows them to buy sovereign bonds if spreads widen disorderly. They're basically coupling QT with a backstop against fragmentation. Lucas: So the big picture: quantitative tightening is not a blunt instrument anymore. Central banks are sequencing it carefully, using caps, standing facilities, and swap lines to avoid accidents. But the ultimate destination is a much smaller footprint than what we saw in 2021. Luna: And the destination isn't zero. The Fed has said they'll stop around two and a half to three trillion above the pre-crisis level. That's because the modern payment system requires more reserves. So we're not going back to the old normal — we're landing on a new plateau. Lucas: Exactly. That plateau will depend on structural changes like the shift to instant payments and the growing Treasury cash balance. But for now, the process is humming along. The big question for the next twelve months: will the pace need to slow again if the economy softens?