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📚 Stock Market Glossary

Clear, beginner-friendly explanations, real-world analogies, and visual formulas for key stock market terminology.

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Covered Interest Parity (CIP)

Macroeconomy
💡 Key Takeaway: A foundational international finance condition stating that the interest rate differential between two currencies must equal the differential between forward and spot exchange rates when fully hedged.
Riskless Currency Lock-in Analogy: If a US bank pays 5% interest while a foreign bank pays 3%, the forward currency contract must discount the US dollar by exactly 2% to ensure an investor locking in exchange rates today achieves identical net returns in both countries.
😎 10-Second Show-off Pro Tip for Friends!
☕ Show-off Tip: 'Never buy currency-hedged US bond ETFs without calculating the CIP hedging cost. Because of the wide US-Korea interest rate differential, annual forward hedging costs eat up nearly 200 bps of headline yield.'

📖 Beginner-Friendly Explanation

STEP 1

Core Concept & Meaning

Covered Interest Parity (CIP) is a cornerstone theoretical condition in international finance stating that when foreign exchange risk is fully hedged using forward FX contracts, the nominal interest rate spread between two countries must equal the forward exchange rate premium or discount.

If US interest rates exceed Korean interest rates by 2.0%, the forward dollar must trade at a 2.0% discount against the Korean won to eliminate riskless cross-border arbitrage opportunities.

STEP 2

Why It Matters & Mechanism

  • The Post-2008 CIP Breakdown: Following the 2008 crisis and stricter Basel III bank balance sheet regulations, CIP frequently breaks down in real-world trading, creating persistent Cross-Currency Basis spreads.
  • Barometer of Global Dollar Funding Strain: A widening negative cross-currency swap basis signals severe institutional dollar shortages across international banking hubs.
  • Dictates FX Hedging Costs for Global Asset Allocators: Directly determines whether institutional pension funds and insurers incur heavy hedging costs or capture yield windfalls when investing in foreign bonds.
STEP 3

Practical Investment Tips & Pitfalls

When the Fed-BOK interest rate spread widens, Korean institutional investors face severe FX hedging costs (often 150 to 200 bps annualized) on US Treasury holdings, turning attractive headline US yields into negative net local returns. Always analyze CIP hedging drags before picking hedged (H) vs unhedged (UH) global bond ETFs.

📊 Covered Interest Rate Parity (CIP) Equilibrium Formula
(1 + i_domestic) = (Spot / Forward) x (1 + i_foreign) | Linear Approx: (Forward - Spot) / Spot ≒ i_domestic - i_foreign
▶ Spot: Current spot exchange rate | Forward: Contracted forward exchange rate. ▶ i_domestic: Domestic risk-free rate | i_foreign: Foreign risk-free rate. ▶ No-arbitrage holds when the forward currency discount exactly matches the international interest rate differential.

⚖️ Key Comparison at a Glance

TheoryCovered Interest Parity (CIP)Uncovered Interest Parity (UIP)Purchasing Power Parity (PPP)
Hedging Strategy100% fully hedged via forward FX contractsUnhedged (Exposed to future spot volatility)Not applicable (Goods & basket price based)
Core AssumptionArbitrage-free frictionless capital mobilityRisk-neutral investors & rational expectationsLaw of One Price across global trade
Empirical ValidityStrong baseline in short-term money marketsFrequently violates in short run (Carry Trades)Valid only over long-term multi-year horizons
Key ApplicationFX hedge cost pricing, cross-currency basisFX carry trade strategy designBig Mac Index, long-term equilibrium valuation
⚔️ Don't Mix These Up! (Head-to-Head Comparison)
VSCross-Currency Basis Swap
View Cross-Currency→
💡 Crucial Difference: CIP is the theoretical no-arbitrage equilibrium, whereas cross-currency basis measures the actual real-world deviation (dollar premium) resulting from bank balance sheet constraints.
VSYen Carry Trade
View Yen→
💡 Crucial Difference: A carry trade exploits interest differentials without currency hedging (uncovered), while CIP governs fully-hedged forward arbitrage parity.

📌 Practical Market & Real-World Example

Pension Fund O purchased $1.0B in 10-year US Treasuries yielding 4.3% while executing a 1-year forward FX hedge. Under CIP parity, the 1.7% annualized forward hedging cost reduced the net hedged KRW yield to 2.6%.