Latest / Monetary Policy Explained with Fexingo: Central Banks, Money Supply, and Interest Rates / How Central Banks Actually Move Money Through The System
Transcript
- Lucas: If walking through the economy with us has made something click, we’d be grateful if you considered supporting the show directly. It’s ad-free because listeners like you keep the lights on. Luna: And honestly, if today was worth a coffee to you, that's the link — buy me a coffee dot com slash fexingo. Lucas: Thanks for that. Now, let’s get back into the weeds. There is a persistent misconception about how central banks control the money supply. People imagine a physical printing press churning out hundred-dollar bills, but the reality is much more digital and structural. Today, we are going to dissect the actual plumbing of the monetary system, specifically focusing on how the Federal Reserve influences liquidity without just flooding the market with cash. Luna: Right, because the old model of the money multiplier—that one dollar of reserves creates ten dollars of loans—is basically dead, as we discussed in previous episodes. So what replaced it? Lucas: Exactly. The money multiplier was always more of a theoretical construct than a practical constraint. What actually drives credit creation now is the demand for loans from creditworthy borrowers, constrained only by capital requirements and liquidity rules, not by the amount of reserves sitting in a vault. The central bank’s role has shifted from controlling the quantity of money to managing the price of money, which is the interest rate. Luna: So if they aren't limiting the supply, how do they ensure that rates don't crash to zero or spike uncontrollably? It feels like they are steering a ship without a rudder. Lucas: They have a rudder, it’s just called the floor system. By setting the Interest on Reserve Balances, or IOER, the Fed gives banks a risk-free return for parking their excess reserves at the central bank. This effectively puts a floor under short-term interest rates because no bank would lend money in the interbank market at a rate lower than what they can get risk-free from the Fed. Luna: That makes sense for large banks, but what about the rest of the financial system? How does that trickle down to the person trying to borrow for a business expansion? Lucas: It trickles down through the repo market. This is the overnight lending market where financial institutions borrow cash against collateral, usually Treasuries. When the Fed conducts open market operations, it buys these securities from primary dealers, injecting reserves into the system. This increases the supply of cash in the repo market, pushing down the overnight rate, which then correlates with longer-term borrowing costs. Luna: But during the 2019 repo crisis, those rates spiked even though the Fed had plenty of reserves. Wasn't that a failure of the floor system? Lucas: It was a failure of distribution, not design. The problem wasn't that there wasn't enough total liquidity, but that the liquidity was trapped in certain parts of the shadow banking sector that couldn't access the Fed’s discount window easily. The Fed had to step in with temporary lending facilities to unclog the pipes. Luna: So the issue is always fragmentation. The money exists, but it can't get to where it needs to go efficiently. That seems to be the recurring theme in modern monetary policy. Lucas: Precisely. And this brings us to the distinction between base money and broad money. Base money is the currency in circulation plus bank reserves. Broad money includes all the deposits created by commercial banks through lending. The Fed controls the base money almost entirely, but they have very little direct control over broad money, which depends on private bank behavior. Luna: Which explains why printing trillions during the pandemic didn't immediately cause hyperinflation. The velocity of money slowed down, and banks were hesitant to lend aggressively despite having ample reserves. Lucas: Spot on. The transmission mechanism broke because the demand side collapsed initially due to uncertainty, and then later, fiscal policy did the heavy lifting for stimulus rather than monetary policy alone. The Fed provided the fuel, but the government built the engine. Luna: It’s interesting how political decisions often overshadow the technical mechanics of the central bank. Does the public even realize how opaque these operations are? Lucas: Most don't, and that opacity is intentional. Transparency is good, but revealing every single transaction could allow arbitrageurs to front-run the Fed’s moves, destabilizing the markets they are trying to stabilize. The art is in providing enough guidance without giving away the playbook. Luna: So forward guidance becomes just as important as the actual trades. If the Fed says they will hold rates steady for a year, that shapes expectations regardless of what happens in the repo market that week. Lucas: Yes, and forward guidance is essentially a commitment device. It anchors long-term yields to the short-term policy rate. If investors believe the Fed will keep rates low, they lock in longer-term bonds at lower yields, which stimulates investment in housing and capital expenditures. Luna: But what happens when that guidance fails? Like when inflation surged in twenty-twenty-one and twenty-twenty-two? The Fed said it was transitory, and everyone got burned. Lucas: That was a massive error in judgment, rooted in flawed economic models that underestimated the supply-side constraints of post-pandemic recovery. It showed that central banks are not omniscient; they are reactive institutions bound by imperfect data and human bias. Luna: It also highlighted the lag effect. Monetary policy takes eighteen to twenty-four months to fully impact the economy. By the time they realized the mistake, the damage was already baked into the price levels. Lucas: Exactly. And correcting that mistake required raising rates aggressively, which shocked the system. We saw stress in the regional banking sector in early twenty-twenty-four, partly because those banks held long-duration assets that lost value when rates rose. Luna: So the very tool used to control inflation—raising rates—can create instability in the banking sector if the balance sheets aren't managed carefully. It’s a tightrope walk. Lucas: It is. And this is where the concept of 'higher for longer' comes in. The Fed isn't just fighting inflation anymore; they are managing the risk of breaking the financial system while trying to cool the labor market. It’s a delicate calibration of two competing objectives. Luna: Do you think the current framework, which allows for flexible averaging of inflation targets, is robust enough to handle future shocks? Or do we need a new paradigm entirely? Lucas: The flexible average targeting was a good experiment, but it may be too passive for an era of supply shocks. We might see a return to more traditional inflation targeting, where the central bank reacts faster to deviations from the target, even if it causes more volatility in the short term. Luna: Volatility is the price of credibility, right? If the market knows the Fed will act decisively, they won't bet against them as often. Lucas: Agreed. But credibility is hard-won and easy to lose. The last few years have tested that credibility significantly. The key now is consistency in communication and action. Luna: Let’s talk about the international angle. The US Federal Reserve sets the tone, but what about the European Central Bank or the Bank of Japan? Are they playing the same game? Lucas: Not exactly. The ECB faces a different challenge because the Eurozone is fragmented. They have to manage monetary policy across countries with vastly different fiscal positions and debt levels. The Bank of Japan, meanwhile, is still grappling with decades of deflationary pressure and an aging population, making their exit from negative rates incredibly risky. Luna: So global synchronization is harder than it looks. A rate cut in America might trigger capital flight in emerging markets if the dollar strengthens too quickly. Lucas: That’s the Triffin dilemma updated for the digital age. The US dollar is the world’s reserve currency, so American monetary policy has global externalities. The Fed has to consider not just domestic employment, but the stability of the global financial architecture. Luna: It puts a lot of responsibility on Washington. Do you think that leads to policy paralysis? Being afraid to make a move because of the ripple effects abroad? Lucas: Sometimes. But historically, the Fed has prioritized domestic mandates first. The global consequences are secondary, though increasingly difficult to ignore. We are seeing more currency swaps and bilateral agreements as a workaround. Luna: Currency swaps. Those are the emergency bridges between central banks. They remind us that the system is fragile, even if it looks stable on the surface. Lucas: They are. And as we move forward, the rise of digital currencies and potential central bank digital currencies, or CBDCs, could fundamentally change how this plumbing works. Imagine instant settlement and programmable money. Luna: That sounds efficient but also terrifying from a privacy standpoint. Plus, it could disintermediate commercial banks if everyone holds accounts directly with the Fed. Lucas: That’s the big fear. Most proposals for CBDCs include a tiered system to prevent bank runs. But the technology is advancing faster than the regulation. We might see pilot programs in major economies within the next few years. Luna: I’ll be watching that closely. It’s the biggest structural shift since the end of the gold standard. I wonder if the average consumer will even notice the difference until it’s too late. Lucas: Probably not. But the implications for monetary transmission will be profound. If the Fed can send stimulus directly to wallets, bypassing banks, the entire dynamic of credit creation changes overnight. Luna: direct to consumer monetary policy. That’s a scary thought for anyone who values the buffer of intermediaries. Lucas: It is. But progress doesn't stop. The question is whether we adapt our regulatory frameworks fast enough to harness the benefits without losing the stability that has kept the global economy growing for decades. Luna: Adaptation is the keyword. The system is constantly evolving, and staying informed is the best defense against being blindsided by these structural shifts. Lucas: Well said. As we wrap up, I’m left wondering: if the plumbing is this complex and fragile, should we be trusting central banks with such absolute power, or is it the least bad option we have? Luna: Probably the least bad option, but certainly one that requires constant scrutiny and skepticism from the public and policymakers alike.