Forex Fundamentals·Currency Pairs & The Forex Market
Currency Pairs Explained
You Always Trade Two Currencies
In forex, you never just 'buy the euro.' You buy the euro AND sell the dollar at the same time. That's why everything is quoted as a pair — EUR/USD, GBP/JPY, USD/CHF. Every forex transaction is simultaneously a purchase of one currency and a sale of another. This dual nature is what makes forex unique among financial markets.
Reading a quote · the anatomy of a pip
Definition
Base Currency
The first currency in a pair. When you 'buy EUR/USD,' you are buying the euro. The base currency is what you're buying or selling. Think of it as the currency you're making a bet ON.
Definition
Quote Currency
The second currency in a pair. It tells you how much of this currency you need to buy one unit of the base. If EUR/USD = 1.1050, it costs $1.1050 to buy one euro. The quote currency is what you're paying WITH.
Definition
Currency Code (ISO 4217)
The three-letter international code that identifies each currency. The first two letters usually refer to the country (US = United States, GB = Great Britain, JP = Japan) and the third letter refers to the currency name (D = Dollar, P = Pound, Y = Yen). Examples: USD, GBP, JPY, EUR, CHF.
Reading a pair in plain English
EUR/USD = 1.1050 means: 'One euro costs 1.1050 US dollars.' GBP/JPY = 188.50 means: 'One British pound costs 188.50 Japanese yen.' USD/CHF = 0.8800 means: 'One US dollar costs 0.8800 Swiss francs.'
The Three Categories
Not all currency pairs are created equal. They fall into three groups based on liquidity, trading volume, and the presence of the US dollar. Understanding these categories helps you choose the right pairs for your experience level and trading style.
| Category | Definition | Examples | Typical Spread | Daily Volume |
|---|---|---|---|---|
| Majors | Pairs that include USD + a major economy currency | EUR/USD, GBP/USD, USD/JPY, USD/CHF, AUD/USD, USD/CAD, NZD/USD | 0.5 – 1.5 pips | $500B – $2T+ |
| Minors (Crosses) | Pairs between major currencies, excluding USD | EUR/GBP, GBP/JPY, EUR/JPY, AUD/NZD, EUR/CHF, GBP/CHF | 1.5 – 4 pips | $50B – $200B |
| Exotics | A major currency paired with an emerging market currency | USD/TRY, EUR/ZAR, GBP/MXN, USD/THB, EUR/PLN | 5 – 50+ pips | $1B – $20B |
EUR/USD is by far the most traded pair in the world, accounting for roughly 23% of all forex volume. USD/JPY comes second at about 13%, followed by GBP/USD at around 10%. These three pairs alone make up nearly half of all global forex trading.
| Pair | Nickname | Why It Matters | Share of Global Volume |
|---|---|---|---|
| EUR/USD | Fiber | World's two largest economies — most liquid, tightest spreads | ~23% |
| USD/JPY | Gopher | Risk sentiment barometer — sensitive to risk-on/risk-off shifts | ~13% |
| GBP/USD | Cable | Named after transatlantic telegraph cable — volatile, big daily ranges | ~10% |
| USD/CHF | Swissie | Safe-haven pair — CHF strengthens during global uncertainty | ~5% |
| AUD/USD | Aussie | Commodity currency — tracks China growth and iron ore prices | ~5% |
| USD/CAD | Loonie | Oil-correlated — Canadian economy tied to crude oil exports | ~5% |
| NZD/USD | Kiwi | Dairy and commodity exports — sensitive to China demand and risk appetite | ~2% |
Stick to the majors at first
Exotic pairs have wide spreads (sometimes 30-50 pips) and erratic moves driven by political instability. The Turkish lira (TRY) lost over 40% of its value in 2021 alone. As a beginner, focus on EUR/USD, GBP/USD, and USD/JPY — they have the tightest spreads and the most predictable behavior.
Reading a Forex Quote
Let's say EUR/USD is quoted at 1.1050. This means 1 euro costs $1.1050. If the price rises to 1.1150, the euro got stronger (or the dollar got weaker). If it drops to 1.0950, the euro got weaker (or the dollar got stronger). Remember: the price is always expressed in terms of the quote currency.
How to Interpret Any Forex Quote
- 1
Identify the base
The first currency listed (left of the slash) is always the base. In EUR/USD, EUR is the base.
- 2
Identify the quote
The second currency (right of the slash) is the quote. In EUR/USD, USD is the quote.
- 3
Read the price
The number tells you how much quote currency buys one unit of base. EUR/USD = 1.1050 means 1 EUR = 1.1050 USD.
- 4
Price goes up
The base currency is strengthening (or the quote is weakening). EUR/USD rising = euro getting stronger.
- 5
Price goes down
The base currency is weakening (or the quote is strengthening). EUR/USD falling = dollar getting stronger.
Quick profit example
You buy EUR/USD at 1.1050 because you think the euro will strengthen. It rises to 1.1150. You made 100 pips of profit. On a mini lot (10,000 units), that's $100. On a standard lot (100,000 units), that's $1,000.
Correlation Between Pairs
Some currency pairs move together (positive correlation) and some move in opposite directions (negative correlation). Understanding these relationships helps you avoid accidentally doubling your risk or taking offsetting positions.
| Pair 1 | Pair 2 | Correlation | Why |
|---|---|---|---|
| EUR/USD | GBP/USD | Strong positive (~0.85) | Both are USD quote pairs — when USD weakens, both rise |
| EUR/USD | USD/CHF | Strong negative (~-0.90) | Mirror pairs — EUR/USD up usually means USD/CHF down |
| AUD/USD | NZD/USD | Strong positive (~0.90) | Both are commodity currencies in the same region |
| USD/JPY | EUR/JPY | Moderate positive (~0.60) | Both involve JPY — risk sentiment affects both |
| USD/CAD | Oil (WTI) | Negative (~-0.75) | Higher oil = stronger CAD = lower USD/CAD |
Hidden double exposure
If you're long EUR/USD and long GBP/USD, you effectively have double the USD short exposure. If USD suddenly strengthens (e.g., a surprise Fed hike), both positions lose simultaneously. Always check correlations before opening multiple positions.
Knowledge check
In the pair GBP/USD, which is the base currency?
Knowledge check
EUR/USD and USD/CHF have a strong negative correlation. If EUR/USD rises 80 pips, what would you expect USD/CHF to do?