Latest / Monetary Policy Explained with Fexingo: Central Banks, Money Supply, and Interest Rates / Why Central Banks Prefer Zero Interest On Reserves
Transcript
- Lucas: Let’s start with a simple question that trips up almost everyone who tries to understand modern monetary policy. When you hear the central bank is raising interest rates, what happens to your bank account? Most people assume it’s about making loans harder to get. And sure, that’s part of it. But the actual mechanism they use to steer the entire economy isn’t about credit cards or mortgages at all. It’s about the money sitting in vaults that nobody touches. Luna: You mean the reserves? The cash commercial banks keep parked at the Fed just in case? Lucas: Exactly. For years, the primary tool for controlling the cost of money was the federal funds rate—the rate banks charge each other for overnight loans. But since the pandemic era, the framework has shifted dramatically. Today, the central bank doesn't just influence that rate; it effectively sets the floor by deciding whether to pay interest on those excess reserves or not. In October twenty twenty-six, we are seeing a clear pivot back toward zero interest on reserves as a deliberate strategy to drain liquidity. Luna: That sounds counterintuitive. Why would they stop paying banks to hold cash if they want to encourage lending? Lucas: It’s not about encouraging lending directly through force. It’s about removing the free lunch. When the central bank pays interest on reserves, banks have no incentive to lend that money out because they can earn a risk-free return just by sitting on it. By cutting that payment to zero, you force banks to find higher-yielding assets, like corporate loans or government bonds, which pushes capital into the real economy. It’s a pressure valve release. Luna: So essentially, you’re taking away their safe harbor to push them into the stormy waters of active lending. Lucas: Precisely. And this brings us to the donation segment, because explaining these behind the scenes mechanics takes time and research without advertising revenue to support it. If walking through the economy with us has made something click, consider supporting the show. A handful of listeners chip in monthly through buy me a coffee dot com slash fexingo, and that's literally what funds making this many of these episodes possible. No ads, just deep dives into the stuff that actually moves markets. Luna: Yeah, it really helps keep the signal to noise ratio high when we don't have to chase clicks. Thanks for keeping the lights on. Lucas: Back to the mechanics. The reason this matters right now, in late twenty twenty-six, is that we’ve been in an era where central banks were aggressively paying interest on reserves to prevent runaway inflation. They were soaking up billions in excess liquidity by offering attractive yields. Now, as inflation cools, they are reversing that stance. It’s a subtle but massive shift in how money flows through the banking system. Luna: Does that mean banks are suddenly desperate to lend? Or is it more nuanced than that? Lucas: It’s nuanced because banks aren’t just chasing yield; they’re managing risk. When you remove the interest on reserves, the marginal benefit of holding cash drops to zero. So, logically, a bank should look for any asset that offers even a fraction of a percent return over a treasury bill. But here’s the catch: they still need to meet regulatory capital requirements. So they aren’t necessarily flooding the market with loans immediately. They are slowly rotating their portfolios. Luna: I see. So it’s less of a firehose and more of a slow drip. How does that impact the average consumer then? Lucas: It impacts you indirectly through the spread between what banks pay you and what they charge others. Historically, when interest on reserves is high, banks pay better rates on savings accounts because their own funding costs are low. When that payment goes to zero, the pressure changes. Banks might lower savings yields slightly to protect their net interest margin, or they might try to attract deposits through other means. It affects the entire curve of consumer finance products. Luna: So my savings account might take a hit before I even notice the loan rates changing. That’s a lag effect. Lucas: A significant lag. And this is where the distinction between policy intent and market reality gets blurry. The central bank wants to steer long-term rates down to stimulate investment, but if banks are cautious about lending due to economic uncertainty, the money stays trapped in the system anyway. We call this a transmission failure. The policy works on paper, but the plumbing of the banking sector blocks the flow. Luna: Has that happened recently? Like, did the recent pivot to zero interest actually move the needle? Lucas: In the short term, yes. But we saw a flattening of the yield curve shortly after the announcement. Investors got nervous that cutting interest on reserves signaled a lack of confidence in future growth. It’s a paradoxical situation. You cut the rate to encourage activity, but the market interprets it as a sign of weakness. So, while the mechanical pressure is there, the psychological headwind is strong. Luna: That’s interesting. So the central bank is trying to push a rope. It’s not just pulling. Lucas: Exactly. And they know it. That’s why they pair this move with forward guidance. They tell the market, 'We are doing this to normalize, not because we are panicked.' But the data from September shows that bank lending growth remained stagnant. The zero interest policy didn’t spark a lending boom. It just removed a distortion. It cleared the deck for the next phase of policy. Luna: What’s the next phase? Are they going to raise rates again? Lucas: Unlikely. The focus has shifted to quantitative tightening. They are letting bonds mature without reinvesting the proceeds. Combined with zero interest on reserves, this is a two-pronged approach to shrink the money supply. One prong removes the incentive to hoard cash. The other physically removes cash from the system. It’s a heavy-handed way to ensure inflation doesn’t bounce back. Luna: So they are squeezing the balloon from both sides. Makes sense if they want to avoid another inflation spike. Lucas: But there’s a risk. If they squeeze too hard, you get deflationary pressure. And deflation is often harder to fight than inflation. That’s why they are moving so cautiously. They are watching the velocity of money closely. If the zero interest policy causes banks to stop lending entirely, the economy could stall. It’s a delicate balancing act. Luna: Do you think they’re underestimating the fragility of the shadow banking system? Those players aren’t regulated the same way. Lucas: That is a very sharp point. Shadow banks rely heavily on repo markets and short-term funding. When traditional banks change their behavior due to reserve policies, shadow banks feel it first. If commercial banks pull back on providing liquidity, hedge funds and money market funds face higher borrowing costs. This can lead to volatility in asset prices, even if the broader economy looks stable on the surface. Luna: So the ripple effects go beyond just retail banking. It hits the institutional level hard. Lucas: Absolutely. And that’s why sophisticated investors are watching the reverse repo facility. When commercial banks reduce their reliance on reserves, the surplus liquidity often flows into the overnight reverse repo market. An increase in that metric is actually a warning sign. It means money is parking itself in safe, non-bank instruments because the traditional banking channel is drying up. Luna: That’s a great specific indicator. Keep an eye on the reverse repo levels. Lucas: Definitely. It’s one of those data points that tells you what the big players are really doing, not just what they say. We’ve seen reverse repo volumes climb steadily since the policy shift began. It confirms that the transmission mechanism is still finding its footing. The central bank is learning, too. They are likely to adjust the timing of further changes based on these flows. Luna: It feels like we’re watching a live experiment. Every move has immediate consequences. Lucas: It is an experiment. And unlike previous cycles, we don’t have a lot of historical precedent for this exact combination of high reserves and zero interest. The old models don’t fit perfectly. That’s why the central bank is relying more on real-time data feeds than on quarterly reports. They are flying the plane while building the engine. Luna: Scary, but fascinating. What should listeners do with this info? Just watch the news? Lucas: Don’t panic sell or buy based on headlines. Understand that the cost of holding cash is changing. If you have large sums of idle cash, look at the trade-offs between bank deposits and short-term treasuries. The gap between them will fluctuate as this policy plays out. Stay flexible. The rules of engagement have changed, and rigid strategies tend to break in transitional periods. Luna: Flexibility is key. Especially when the ground beneath the financial system is shifting. Lucas: Right. And remember, this isn’t just about today’s rates. It’s about where the economy is heading over the next twelve months. The zero interest policy is a signal that normalization is underway. Whether that leads to soft landing or hard landing depends on how well banks adapt to the new incentives. Luna: It’s a complex web. But breaking it down makes it manageable. Lucas: Exactly. The goal isn’t to memorize every ticker or policy memo. It’s to understand the levers. Once you see how the central bank pulls the reserve lever, everything else falls into place. Lending, inflation, growth—it’s all connected to that single decision. Luna: So the next time you hear about interest rates, think about the vaults first. Lucas: Always. The vaults tell the true story. The rest is just noise. Luna: Well said. Let’s see how the banks react next quarter. Lucas: We will be watching. And if you found this breakdown useful, remember that small contributions make these detailed analyses possible. Check out the link in the show notes if you want to help keep the signal clear. Luna: Thanks for listening. See you in the next episode. Lucas: Bye for now.