Central Banks & Monetary Policy

Learning objectives

By the end you can:

1. Explain what a central bank is and does from first principles: the three functions (banker to the banks; banker to and debt-manager for the government; monetary authority) and the lender-of-last-resort role. Say why a system of private money-creating banks needs an apex institution at all.
2. Compare the mandates of the US Federal Reserve (the dual mandate: maximum employment and price stability), the European Central Bank (price-stability primacy), and the Reserve Bank of India (flexible inflation targeting, a 4% CPI target with a ±2% tolerance band, mark "verify"), and describe how the FOMC and the MPC are structured and actually vote.
3. Describe how a central bank sets "the" interest rate: the policy rate and the liquidity corridor (the repo rate and the SDF/MSF corridor in India; the fed funds target range and IORB/ON-RRP floor in the US). Explain what open-market operations do that a rate announcement alone does not.
4. State each tool's mechanism with an example: the policy rate, OMOs, QE/QT, the CRR and the (India-specific) SLR, forward guidance, and FX intervention. In particular, explain precisely what QE does and does not do, using the reserves-versus-broad-money distinction inherited from M7.01.
5. Define the money-supply aggregates M0/M1/M2/M3 (what each includes, India and US), and explain why base money ≠ broad money, tying the gap back to bank money-creation and forward to the money multiplier.
6. Trace the monetary-transmission mechanism from a policy-rate change through money-market rates → bank deposit and lending rates → the cost and availability of credit → borrowing, spending and investment → the output gap → inflation, across all the channels. Explain Friedman's "long and variable lags" and why they make policy genuinely hard.
7. Read a policy statement and the minutes like an analyst: decode hawkish versus dovish language, the stance, the vote split, and the Fed's Summary of Economic Projections and dot plot. Separate the market-moving signal from the boilerplate.
8. Argue the central-bank-independence debate evenhandedly, and explain why the policy rate is the "gravity" of every valuation: the bridge to M7.03 (rates and the yield curve) and back to M3.03 (the cost of capital).

Prerequisites & connections

Builds on. M7.01: this module is unintelligible without the money-creation mechanics. That commercial banks create broad money by lending (loans create deposits), that the central bank creates only base money (reserves + currency), and that the two are different things is the single most important idea carried forward, and it is the whole key to understanding QE. M7.01's short-term debt cycle is the thing monetary policy is trying to smooth. M3.01 gave you time value of money and discounting, and the reason a change in "the rate" changes every asset price is pure present-value arithmetic, and §4.10 cashes that in. M3.03 built the cost of capital: the risk-free rate that anchors CAPM and WACC is built on the policy rate and its expected path, so this module explains where the very first input of every valuation comes from. M3.05 covered reverse DCF and duration: "long-duration assets fall hardest when rates rise" is a sensitivity you already computed; here you learn what moves the rate. M5.01 covered banks: the CRR, SLR, CASA, NIM, and the CD ratio are the plumbing through which policy actually reaches the economy, and a bank's asset-versus-liability sensitivity (how fast loans reprice versus deposits) is the transmission mechanism seen from inside one firm. M0.03 gave you real versus nominal (Fisher): inflation is what monetary policy targets, and the real rate is what actually matters for behaviour.

Feeds forward. M7.03 (inflation, rates, and the yield curve) takes the policy rate produced here and follows it out the curve (the 10-year is roughly the average expected future policy rate plus a term premium), into the CPI/core/PCE/WPI measures the mandates target, and into the inversion signal. M7.04 (fiscal policy and sovereign debt): the fiscal–monetary interaction, deficit monetization, and fiscal dominance are the dark twin of central-bank independence (§4.9), and QE's blurring of the line between monetary and debt-management operations is where they meet. M7.05 (cycles, bubbles and crises): the lender-of-last-resort role (§4.1) is the central bank's crisis function, and every case study (2008, 2020) turns on what the central bank did and how fast. M7.06 (FX and the dollar system): FX intervention (§4.4) and the impossible trinity are previewed here and formalized there; the Fed's swap lines are lender-of-last-resort for the global dollar system. M7.07 (the dashboard capstone): the policy rate, its implied path, the balance sheet, and the money aggregates are core dashboard indicators, read as rate-of-change versus expectations. Competency C8, "understand the macro machine", is built substantially here: after this module you can read a central-bank statement and know what it means for the gravity under every price.