Exchange Rate

How exchange rates are quoted

A quote shows how much of one currency you get per unit of another. Common conventions:

• EUR/USD = 1.10 — one Euro buys 1.10 US dollars.
• USD/JPY = 150 — one US dollar buys 150 Japanese yen.
• GBP/USD = 1.27 — one British pound buys 1.27 US dollars.

The base currency comes first; the quote currency comes second. EUR/USD rising means the Euro is strengthening against the dollar (or the dollar weakening against the Euro).

Floating vs. fixed regimes

Modern major currencies typically float — their value is set by market supply and demand in forex markets. Major free-floating currencies: USD, EUR, JPY, GBP, AUD, CAD, CHF.

Some currencies are pegged to a major reserve currency:

• Hong Kong Dollar pegged to USD via a currency board.
• Saudi Riyal pegged to USD.
• Many Caribbean and African currencies pegged to USD or Euro.
• Hong Kong's peg has held since 1983; others have broken under pressure (Argentina's currency board ended in 2002, UK's ERM exit in 1992).

Maintaining a peg requires the central bank to defend it through reserves and rate policy — sometimes at significant cost.

What moves exchange rates

Several primary drivers:

• Interest-rate differentials. Higher interest rates attract capital flows, strengthening the currency. The Fed hiking aggressively in 2022 strengthened the dollar against most major currencies that year.
• Inflation differentials. Higher inflation typically weakens a currency over time as purchasing power erodes.
• Current account balance. Trade deficits tend to weigh on currencies; surpluses support them, all else equal.
• Capital flows. Investment flows in and out of a country move the currency. Strong stock markets often attract foreign capital, supporting the currency.
• Political stability. Currencies of stable democracies tend to outperform those of unstable regimes during periods of stress.
• Commodity prices. Currencies of commodity exporters (CAD, AUD, BRL) often move with their primary export prices.

Why exchange rates matter

Effects of exchange-rate moves:

• Trade. A strong domestic currency makes exports more expensive abroad and imports cheaper at home. Weak currency does the opposite.
• Investment returns. A US investor in international stocks captures both the local return and the currency move. A 10% local return paired with a 5% currency depreciation produces only ~5% in dollar terms.
• Tourism. A weak domestic currency makes foreign travel more expensive but attracts foreign visitors.
• Inflation. Imported goods become cheaper or more expensive depending on currency direction. Currency-driven inflation is significant in import-heavy economies.
• Debt service. Foreign-currency debt becomes more expensive in domestic terms when the local currency weakens. This was central to several emerging-market crises.

Hedging currency exposure

Investors and businesses with foreign-currency exposure can hedge:

• Forward contracts. Lock in an exchange rate for a future date.
• Currency futures and options. Standardized exchange-traded versions.
• Currency-hedged ETFs. International equity exposure with the currency component hedged.
• Natural hedges. Multinational businesses match revenues and costs in the same currency.

For long-term equity investors, the consensus is that currency hedging adds little value over long horizons (currency volatility averages out, hedging adds cost). For short-horizon and fixed-income exposures, hedging adds more value.

Crypto and exchange rates

Stablecoins on chains have become a meaningful currency channel:

• USDC and USDT function as digital dollar substitutes globally. Cross-border transfers in stablecoins often beat traditional FX channels on speed and cost.
• In high-inflation countries (Argentina, Turkey, Lebanon), USDT adoption has grown as a way for citizens to hold dollar-equivalent value despite local capital controls.
• DeFi swaps between stablecoins of different currencies (USDC/EUR, USDT/JPY) have small but growing volume.

These developments don't displace traditional FX markets at scale (yet) but represent a meaningful new channel, particularly for retail and emerging-market use cases.

What individual investors should do

For most personal financial planning:

• Hold most assets in your home currency. Avoiding currency mismatch reduces volatility relative to your spending.
• Allow modest international diversification. Some non-home-currency exposure provides diversification without overwhelming the portfolio.
• Don't try to forecast FX. Major currencies are extremely hard to predict short-term. Even professionals do this poorly.
• For specific goals in foreign currency (retirement abroad, foreign property, child's foreign education) — consider hedging or holding assets in the relevant currency.

Currency dynamics are mostly background noise for long-term investors. They become important to plan around only in specific circumstances.