How does the second-generation currency crisis model explain self-fulfilling speculative attacks, and what role do multiple equilibria play?

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AcadiFi · Accepted Answer

The second-generation currency crisis model, developed by Obstfeld (1994-1996), introduces the concept of self-fulfilling crises where speculative attacks can occur even when fundamentals are not inevitably deteriorating. The key innovation is that government policy responds endogenously to market expectations, creating multiple equilibria. **The Multiple Equilibria Framework** Unlike first-generation models where the crisis is deterministic, second-generation models identify a "zone of vulnerability" where both a crisis and no-crisis outcome are possible equilibria. **Worked Example — Kingdom of Aldermere:** Aldermere maintains a currency peg and has moderate (not extreme) fundamentals: unemployment at 9.5%, government debt at 68% of GDP, and adequate but not abundant reserves. | Equilibrium | Market Belief | Interest Rates | Government Response | Outcome | |---|---|---|---|---| | **Good** | Peg will hold | Normal (4%) | Maintain peg at low cost | Peg survives | | **Bad** | Peg will break | Spike to 18% | Cost of defending too high | Peg abandoned | **How Self-Fulfilling Dynamics Work:** 1. Speculators expect a devaluation and sell the currency 2. The central bank must raise interest rates to defend the peg 3. Higher rates increase unemployment and the government debt-service burden 4. The rising economic cost of defense makes abandoning the peg rational for the government 5. The government devalues — confirming the initial expectation The crisis is self-fulfilling because the speculative attack itself creates the conditions that make the devaluation optimal. \`\`\`mermaid flowchart TD A["Fundamentals in
Vulnerable Zone"] --> B["Two Possible
Equilibria"] B --> C["Good Equilibrium"] B --> D["Bad Equilibrium"] C --> E["Markets Trust Peg"] E --> F["Low Defense Cost"] F --> G["Government
Maintains Peg"] D --> H["Markets Attack"] H --> I["Interest Rates Spike
to Defend"] I --> J["Economic Cost
Becomes Prohibitive"] J --> K["Government
Abandons Peg"] K --> L["Attack Validated:
Self-Fulfilling"] \`\`\` **The Three Zones:** | Zone | Fundamentals | Crisis Possible? | |---|---|---| | Strong fundamentals | Debt low, reserves high, growth strong | No — government can withstand any attack | | **Vulnerable zone** | **Moderate stress, adequate reserves** | **Yes — self-fulfilling attack possible** | | Weak fundamentals | First-generation conditions | Inevitable — crisis occurs regardless | **What Determines Which Equilibrium Prevails?** 1. **Coordination among speculators** — if enough speculators attack simultaneously, the defense cost exceeds the benefit of maintaining the peg. This is a coordination game where sunspots, rumors, or contagion can tip the balance. 2. **Government's revealed preferences** — governments that have previously abandoned pegs under pressure are more vulnerable because markets assign higher probability to capitulation. 3. **Contagion** — a crisis in a neighboring country can shift expectations and trigger an attack on a fundamentally sound country (e.g., Thailand 1997 spreading to Korea and Indonesia). 4. **Transparency** — greater transparency about reserves and policy intentions can reduce vulnerability by making it harder for false narratives to gain traction. **Key Distinction from First-Generation:** In first-generation models, speculators are merely hastening an inevitable crisis. In second-generation models, speculators can cause a crisis that would not have occurred without their attack — the crisis is genuinely self-fulfilling. For CFA Level II, the policy implication is that maintaining large reserves and credible commitment mechanisms can keep an economy in the "good equilibrium" even when fundamentals are in the vulnerable zone. Review our CFA Level II Economics course for exchange rate crisis analysis.

How does the second-generation currency crisis model explain self-fulfilling speculative attacks, and what role do multiple equilibria play?

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