Fiscal Policy & Sovereign Debt

Learning objectives

By the end you can:

1. Build the government budget from first principles: separate revenue (tax and non-tax) from expenditure (revenue/current vs capital), define the deficit as the gap that must be borrowed, and read the actual structure of both the Indian Union Budget (revenue vs capital receipts and expenditure; the FRBM framing) and the US federal budget (mandatory vs discretionary vs net interest).
2. Decompose any deficit into its three meaningful layers: the headline (fiscal) deficit, the primary deficit (headline minus interest, which is today's discretionary stance stripped of the legacy of past borrowing), and the structural / cyclically-adjusted deficit (what the deficit would be at full employment, separating the discretionary part from the part the business cycle is doing automatically). Then perform the decomposition on real numbers.
3. Derive and apply the debt-dynamics equation: obtain Δd ≈ (r − g)·d − p from the government budget constraint, explain every term, compute the debt-stabilizing primary balance p* = (r − g)·d, and run a multi-year debt-path simulation for a benign (r < g) and a trap (r > g) scenario, showing why r vs g is the master variable of sovereign solvency.
4. Reason about fiscal multipliers and crowding out: state when the multiplier on a rupee of spending is greater than 1 (deep recession, zero lower bound, high-MPC recipients, productive public investment) and when it is less than 1 (full employment, monetary offset, import leakage, Ricardian saving), and explain the crowding-out mechanism and the specific conditions (the zero bound, idle resources, crowding-in via public investment) under which it does not bite.
5. Explain automatic stabilizers and the fiscal-monetary interface: describe how progressive taxes and transfers dampen the cycle without new legislation (and why India's are weaker than the US's), and define fiscal dominance, the inflation tax / seigniorage, and financial repression, the channels through which unsustainable debt forces the central bank's hand. Use India's deliberate institutional wall (the FRBM bar on primary-market monetization) as the counter-case.
6. Present the MMT debate evenhandedly: steelman Stephanie Kelton's Modern Monetary Theory (a fiat-currency issuer cannot be forced to default in its own currency; the true constraint is inflation and real resources, not solvency) and the mainstream critique (inflation control via fiscal fine-tuning is politically unreliable, which is the "off switch" problem; the exchange-rate/external constraint binds hard for non-reserve currencies), and state the narrow point on which both sides actually agree.
7. Anatomize sovereign debt crises through the denomination-is-destiny lens: explain why own-currency debt makes default a choice (risk = inflation) while foreign-currency debt makes it a possibility (risk = hard default), and walk the mechanics of Greece (the euro straitjacket, which is foreign-currency debt in disguise with no devaluation), Argentina (serial dollar-debt default and the peg trap), the Asian crisis of 1997 (the currency-plus-maturity double mismatch and the sudden stop), and Sri Lanka 2022 (a reserve-exhaustion default on commercial foreign-currency debt).
8. Connect fiscal analysis to security valuation: trace the path from a country's fiscal stance to its sovereign yield and country-risk premium (hence its risk-free rate and every discount rate), and from its fiscal stance to sector-level winners and losers (capex beneficiaries, bond-supply pressure on rates, subsidy and tax shifts), and articulate why India's rupee-debt structure gives its equity market resilience its debt/GDP ratio alone would not suggest.

Prerequisites & connections

Builds on. M0.03 (financial-literacy bootcamp, for real vs nominal and compounding: the debt snowball is compounding applied to a country). M3.01 (time value of money: the budget constraint is a present-value statement, and debt is the discounted sum of future primary balances). M3.02–M3.03 (risk, return, cost of capital: the sovereign yield is the risk-free rate Rf in your CAPM, and Damodaran's country-risk premium is built off the sovereign default spread explained here). M7.01 (the economic machine: S = I and the current account, "good vs bad credit" as ROIC > cost, and money creation, since government borrowing and monetization are the same T-accounts one layer up). M7.02 (central banks: seigniorage, OMOs, and independence, all of which get stress-tested here under fiscal dominance). M7.03 (inflation, rates, the yield curve: the sovereign yield you learned to read is the r in r vs g, and inflation is the tax at the heart of fiscal dominance). M5.01 (banks: the SLR that makes Indian banks captive buyers of government debt, the mechanism of financial repression and the crowding-out channel).