Forex:Impossible Trinity

The Impossible Trinity (Trilemma) is the unbreakable constraint in open-economy macroeconomics: a country cannot simultaneously maintain:

1. Free capital mobility (open flows in/out, no controls)
2. Fixed (or heavily managed) exchange rate
3. Independent monetary policy (setting interest rates freely for domestic goals)

You can only pick two. Trying all three leads to crisis — exactly what happened in Thailand (and much of Asia) in 1997.

How It Played Out in the Asian Financial Crisis

• Thailand (and others) ran a de facto dollar peg (fixed exchange rate) + open capital account (hot money flooded in for high yields).
• They tried to keep independent monetary policy (low rates for growth).
• Result: Massive unhedged foreign borrowing → speculative attacks → reserves drained defending the peg → forced float + massive devaluation → contagion.

Private equity / foreign capital became the stabilizer post-crisis: recapitalizing banks, buying distressed assets, cleaning NPLs, and injecting governance that public systems couldn’t deliver fast enough under the trilemma pressure. Thaksinomics later added populist domestic demand layers on top of that recovery.