How does the first-generation currency crisis model explain speculative attacks, and what fundamental imbalances trigger the collapse of a fixed exchange rate?

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AcadiFi · Accepted Answer

The first-generation currency crisis model, developed by Krugman (1979) and Flood and Garber (1984), explains currency crises as the inevitable consequence of fundamental policy inconsistency — specifically, a fixed exchange rate regime combined with persistent fiscal deficits financed by money creation. **The Incompatible Trinity** The model rests on the impossibility of simultaneously maintaining: (1) a fixed exchange rate, (2) an independent monetary policy, and (3) free capital mobility. When fiscal deficits force money creation, reserves drain predictably until the peg collapses. **Worked Example — Republic of Thornfield:** Thornfield pegs its currency (Thornmark, TM) at 5 TM per US dollar. The government runs a fiscal deficit of 4% of GDP, financed by central bank credit expansion (money printing). | Year | Fiscal Deficit | Domestic Credit Growth | Foreign Reserves | Reserve Cover | |---|---|---|---|---| | Year 0 | 4.0% GDP | +$3.2B | $28.0B | 8.8 months imports | | Year 1 | 4.0% GDP | +$3.2B | $24.8B | 7.8 months | | Year 2 | 4.0% GDP | +$3.2B | $21.6B | 6.7 months | | Year 3 | 4.0% GDP | +$3.2B | $18.4B | 5.7 months | | **Attack** | — | — | **Sudden drain** | **0 months** | **The Speculative Attack Timing:** Speculators do not wait for reserves to reach zero. They attack when reserves fall to the level where — if they do not attack — the post-float exchange rate would be weaker than the pegged rate. This is called the "shadow exchange rate." \`\`\`mermaid flowchart TD A["Fiscal Deficit
Financed by Printing"] --> B["Domestic Credit
Expansion"] B --> C["Excess Money Supply
at Fixed Rate"] C --> D["Private Sector Buys
Foreign Currency"] D --> E["Reserve Drain
Predictable Path"] E --> F{"Shadow Rate >
Pegged Rate?"} F -->|"Not Yet"| E F -->|"Yes"| G["Speculative Attack
Exhausts Remaining Reserves"] G --> H["Peg Collapses
Currency Floats"] H --> I["Exchange Rate Jumps
to Shadow Rate"] \`\`\` **Key Features of First-Generation Crises:** 1. **Predictable and inevitable** — given the policy inconsistency, the crisis is a matter of when, not if. The only uncertainty is the exact timing of the attack. 2. **No speculator irrationality** — speculators are perfectly rational. They attack because it is profitable (buy foreign currency at the pegged rate, sell at the higher post-float rate). 3. **One-time devaluation** — the exchange rate jumps discretely to its new equilibrium at the moment of the attack; there is no overshooting. 4. **Policy blame** — the government's fiscal-monetary policy mix is the root cause, not speculative behavior. **Historical Examples:** - Mexico (1976, 1982) — persistent fiscal deficits and credit expansion led to predictable peso crises - Argentina (early 1980s) — the tablita exchange rate system collapsed under fiscal pressure **Limitations:** The first-generation model cannot explain crises where fundamentals appear sound (e.g., the 1992 ERM crisis or the 1997 Asian crisis), which led to the development of second- and third-generation models. Check our CFA Level II Economics module for currency crisis frameworks.

How does the first-generation currency crisis model explain speculative attacks, and what fundamental imbalances trigger the collapse of a fixed exchange rate?

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