Latest / Monetary Policy Explained with Fexingo: Central Banks, Money Supply, and Interest Rates / How Central Banks Create Money Through Lending
Transcript
- Lucas: If walking through the economy with us has made something click about how money actually works, we want to say thanks. The way these shows stay ad-free is listener support. If today was useful, you can buy me a coffee dot com slash fexingo. Luna: Yeah, it really helps keep the research sharp when you guys aren't chasing clicks. It just means we get to dig deeper into the boring stuff that actually matters. Lucas: Exactly. And speaking of digging deeper, let’s talk about where your money comes from. Specifically, the idea that central banks create money. Most listeners imagine a giant printing press churning out hundred-dollar bills every time the Fed decides to act. But physical currency is less than ten percent of the total money supply. The real magic happens digitally, inside the ledger of the Federal Reserve itself. Luna: So when people hear 'the Fed printed trillions,' they’re visualizing paper stacks, but it’s really just entries in a database? That feels counterintuitive given how scarce cash still feels in daily life. Lucas: It is counterintuitive because we associate money with physical objects. But modern money is essentially a liability on a bank’s balance sheet. When the Federal Reserve wants to add liquidity to the system, it doesn’t mail out bundles of cash. It credits the reserve accounts of commercial banks. These are electronic balances that banks hold at the Fed to settle payments with each other. So yes, it is just database entries, but those entries allow the banking system to lend further, creating even more money downstream. Luna: Right, so the Fed acts as the banker’s banker. If I’m a commercial bank and I need to settle a large transfer with another bank, I use my reserve account at the Fed. What triggers the Fed to add those reserves in the first place? Lucas: The primary mechanism is what we call open market operations, but specifically for short-term liquidity, it’s often done through the repurchase agreement, or repo, market. Imagine a securities dealer needs cash overnight to meet regulatory requirements or fund trades. They take high-quality collateral, like Treasury bonds, and sell them to the Fed with an agreement to buy them back the next day at a slightly higher price. The Fed gives the dealer cash, which eventually flows into the banking system as reserves. Luna: That sounds like a secured loan. Is there any risk for the Fed here if the borrower defaults on buying back the bond? Lucas: There is minimal risk because the collateral is always worth more than the loan, a concept called a haircut. If the value of the Treasury drops, the dealer must post additional collateral. This ensures the Fed is always over-collateralized. However, the reason this matters for you is that these repo operations inject fresh reserves into the system. Without them, banks might hoard cash due to uncertainty, causing interest rates to spike and credit to freeze up. Luna: So injecting reserves is basically preventing a traffic jam in the financial plumbing. But isn’t there a difference between fixing a temporary jam and permanently expanding the money supply? Lucas: Precisely. There is a crucial distinction between temporary repo operations and long-term asset purchases. Repo operations are meant to be rolled over or reversed quickly, keeping the money supply stable. Long-term purchases, known as quantitative easing, involve buying assets without a commitment to sell them back soon. This permanently expands the monetary base. For years, economists debated whether this permanent expansion would cause hyperinflation, especially after the 2008 financial crisis. Luna: And it didn’t, which confused a lot of people. Why did adding trillions in reserves not immediately crash the purchasing power of the dollar? Lucas: Because having reserves at the Fed does not automatically mean banks will lend them out. If demand for loans is weak, or if banks are worried about bad debts, they just sit on those excess reserves. The velocity of money dropped significantly. It wasn’t until 2021 and 2022, when fiscal stimulus hit households and businesses directly, that the pent-up demand met the available liquidity, leading to the inflation we saw later. The mechanism creates the potential for spending, but the behavior drives the actual inflation. Luna: That’s a key insight. The Fed controls the supply side, but consumer and business confidence drive the demand side. So watching the Fed’s balance sheet alone tells you half the story. Lucas: It tells you about capacity, not activity. Let’s look at a concrete example. During the market volatility in March 2020, the repo market seized up. Banks were terrified to lend to each other overnight. The Federal Reserve had to step in and expand its standing repo facility to unprecedented levels. They injected nearly two trillion dollars in reserves in a matter of weeks to ensure the financial system didn’t lock up completely. Luna: Two trillion dollars added to bank reserves instantly. Did that immediately start inflating prices across the board? Lucas: Not immediately. The money stayed in the financial system initially, stabilizing bond markets and interbank lending. It took months for that liquidity to trickle down to wages, housing, and consumer goods. This lag is why monetary policy is often described as having a long and variable lag. You can turn on the tap today, but the water might not reach the garden until next quarter. Luna: So if I’m an investor watching the Fed’s balance sheet grow, I shouldn’t panic about inflation right away. I should watch for signs that the money is actually moving into the real economy. Lucas: Correct. You look at indicators like M2 money supply growth, but also at credit card spending, housing starts, and wage data. Those are the signals that the digital reserves have converted into physical economic activity. Until then, it’s mostly just accounting adjustments within the banking sector. Luna: This makes me think about the current environment. With interest rates where they are now, are banks eager to borrow from the Fed or are they sitting on cash? Lucas: When interest rates are high, borrowing from the Fed becomes expensive relative to other options. Banks prefer to earn interest on their own loans rather than pay the Fed’s discount rate. So in a high-rate environment, the money supply tends to contract naturally as loans are paid down faster than new ones are issued. The Fed doesn’t need to do much; the market does the work for them. Luna: So the Fed’s power is actually about setting the floor and ceiling for rates, rather than directly controlling the volume of money all the time. Lucas: Exactly. They set the price of money via the federal funds rate target. The quantity of money adjusts based on how much banks and borrowers want to transact at that price. It’s a bit like a thermostat. The Fed sets the temperature, but the actual heat output depends on how well insulated your house is and how much heat you choose to generate. Luna: I like that analogy. It takes the mystique out of the 'money printer go brrr' meme. It’s more like a sophisticated valve system than a factory floor. Lucas: A very sophisticated valve system. And one that requires constant monitoring. Remember the Silicon Valley Bank collapse earlier this year? Part of that crisis was driven by a mismatch in liquidity. Banks had put deposits into long-term Treasuries. When rates rose, those assets lost value. When depositors wanted their money back, the banks couldn’t easily access the digital reserves needed to pay them without selling assets at a loss. Luna: So the Fed had to reassure the market that it would provide enough liquidity to prevent a run on the system, effectively guaranteeing that digital reserves would be available. Lucas: They did exactly that. They introduced the Bank Term Funding Program to allow banks to swap their depreciated Treasuries for cash at par value. This prevented a fire sale of assets. It showed that the central bank’s role as lender of last resort is about maintaining trust in the payment system, not just printing money for fun. Luna: Trust is the underlying asset. If people don’t trust that their bank account balance is real and spendable, the whole system collapses regardless of how many zeros are in the database. Lucas: Spot on. And that brings us back to the present day. As we look at the macro landscape in September 2026, the question isn’t whether the Fed can create money—they can. The question is whether they should, and whether doing so will lead to the inflationary outcomes they fear. Luna: Given the structural shifts in supply chains and energy costs, isn’t it harder for them to predict the outcome now compared to ten years ago? Lucas: It is significantly harder. The transmission mechanism of monetary policy has become less predictable. Globalization previously acted as a deflationary force, keeping prices low despite money creation. With deglobalization trends and geopolitical fragmentation, that buffer is gone. So when the Fed injects liquidity now, it may have a stronger impact on consumer prices than it did in the past decade. Luna: Which means investors need to pay closer attention to the composition of that liquidity. Is it going into productive investment or just speculating on existing assets? Lucas: Yes. Asset inflation versus consumer inflation. We’ve seen a lot of liquidity flow into equity markets and real estate recently, driving up valuations without necessarily raising the price of groceries. But that gap is dangerous. If consumer prices catch up to asset prices, the Fed will be forced to tighten policy aggressively, which could trigger a recession. Luna: So the ultimate lesson is that money creation is powerful, but it’s not omnipotent. It relies on human behavior and institutional trust to translate digital numbers into economic reality. Lucas: Exactly. It’s a tool, not a miracle. Understanding how it works helps you anticipate not just what the Fed will do, but what the consequences of their actions will be for your portfolio and your paycheck. Luna: Thanks for breaking that down. It’s a relief to know the system isn’t just random chaos, even if it is complex.