Deficit vs Surplus
Budget and trade balances — how flows show up in FX
- Tell the budget deficit from the current account deficit
- Explain why twin deficits weaken a currency over multi-year horizons
- Identify which currencies have structural surpluses or deficits
The US has run a current-account deficit for 40 straight years. The dollar should be the worst currency on Earth. Instead it's the global reserve. Why? Because in FX, the *kind* of deficit matters more than the size.
Two deficits, two stories
Budget deficit: the government spends more than it taxes. Financed by issuing bonds. Current account deficit: the country buys more from the world than it sells. Financed by foreign investment inflows. Both can be sustained — but only if foreigners keep buying your bonds.
Sells more to the world than it buys. Foreign currency inflows. Tends to support the home currency over long horizons (decades).
Buys more than it sells. Needs foreign capital to fund the gap. Currency stays bid only as long as foreigners trust the assets.
The twin deficit risk
Twin deficits = budget deficit AND current account deficit simultaneously. The country is over-spending domestically AND globally. Foreign capital has to fund both. If trust cracks, capital flees → currency collapses. Emerging markets often hit this wall; reserve currencies (USD) have more rope.
A country has 8% budget deficit + 5% current account deficit + foreign holders losing appetite for its bonds. Likely currency direction?
- Budget deficit ≠ current account deficit
- Both can be sustained if foreigners trust your assets
- Twin deficits + lost trust = currency stress
- USD is the exception because of reserve-currency status
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