Foreign exchange foundations — course checkpoint

You began this course seeing EUR/USD as a number. You finish able to say what it measures, which currency you hold when you buy it, what a pip is worth on any size, where the price came from, and who was on the other side.

Unit 1 — why the market exists

There is no world currency, so every cross-border transaction needs two of them. Four families of reason drive the whole market: trade, investment, official flows, and risk transfer. The first two are why FX exists; the last two are most of the volume.

A €2,000,000 invoice at EUR/GBP 0.8600 costs £1,720,000, and £1,760,000 at 0.8800 — £40,000 of profit moved by a market the retailer never chose to enter. A foreign asset is two positions: €10,000 into a US holding that gained 10% returned +5.13% in euros once EUR/USD went from 1.0800 to 1.1300. And central banks hold around $12 trillion of other people's money, which is why a pegged pair like USD/HKD looks like a flat line and a free float does not.

Unit 2 — reading a quote

A pair is BASE/QUOTE, and the number is how many units of the quote currency one unit of the base costs. EUR/USD 1.0800 means one euro costs 1.08 dollars. Buying the pair means buying the base — long EUR, short USD, simultaneously and unavoidably, because in FX cash is itself a position.

A pip is 0.0001 for most pairs and 0.01 for yen pairs. A standard lot is 100,000 units of the base. Pip value = pip size × units, in the quote currency: $10 per pip on one standard lot of EUR/USD, $6.67 on USD/JPY at 150, $3 on three mini lots.

Every quote is two-sided. You buy at the ask and sell at the bid, so a 1-pip spread costs $10 per standard lot round trip before anything moves. And cross rates are derived: EUR/USD 1.0800 × USD/JPY 150.00 = EUR/JPY 162.00, EUR/USD 1.0800 ÷ GBP/USD 1.2500 = EUR/GBP 0.8640. Let the units cancel and you cannot get it wrong. Triangular arbitrage guarantees the whole grid stays consistent.

Unit 3 — the currency universe

Majors are the seven or so most-traded pairs, and every one contains the dollar. Crosses are pairs without it, historically assembled from two dollar legs — which is why their spread is roughly the sum of both legs. Exotics pair a major with a smaller or restricted currency: a spread of 0.0074% of price on EUR/USD against about 0.135% on USD/ZAR, roughly eighteen times the cost, plus time-zone dependence, event sensitivity, capital controls and NDF markets.

And the dollar sits on about 89% of all trades because of arithmetic: 30 currencies imply 435 possible pairs, or 29 markets if everything routes through one vehicle. Cheaper topology, reinforced by invoicing, reserves and dollar borrowing.

Unit 4 — how the market is structured

FX is OTC and decentralised: no exchange, no consolidated tape, no official close, and prices that legitimately differ between brokers at the same instant. It runs as a relay — Sydney, Tokyo, London, New York — with the deepest liquidity in the London/New York overlap. Spot settles T+2, the day rolls at 17:00 New York, and the weekend produces gaps because banks cannot settle.

The participants form a steep hierarchy: dealer banks and other financial institutions dominate, corporates are single digits, central banks are small in volume and large in influence, retail smaller still. Most FX volume has no opinion — it is hedging, funding and market making.

The three sentences worth keeping

1. Every FX price is a ratio between two moving things. There is no price of a currency, only its price in another currency — which is why "the euro rose" is an incomplete sentence.
2. Buying a pair means buying the base and selling the quote. Every direction question in this market is answered by reading the ticker in order.
3. The spread is the price of liquidity, and liquidity is just how many people are standing there. It explains majors versus exotics, crosses versus legs, the overlap versus the Asian reopen, and the bureau versus the interbank desk — one idea, four observations.

Before you sit it

Each of these is a minute at your desk. Any one that is not names the lesson to reopen first.

• Say why buying a foreign share makes you a currency trader whether you meant to be or not — Why does buying a foreign stock make you a currency trader too?
• Say what one pip is worth on a standard lot of EUR/USD — How much is one pip actually worth?
• Name what every major pair has in common — What makes a currency pair a "major"?
• Say where an FX trade actually happens, given there is no exchange — If there is no exchange, where does an FX trade actually happen?

Try it now

1. The two majors and the cross they imply are below. Read all three closes, compute EURUSD ÷ GBPUSD, and confirm the residual against EURGBP is small enough to be three timestamps rather than a price. That single exercise uses the base/quote convention, cross-rate arithmetic and the missing spread at once.

2. Compute what a 40-pip move is worth on two mini lots of EUR/USD (20,000 units × 0.0001 = $2 per pip, × 40 = $80), then on one standard lot of USD/JPY at 150 ($6.67 × 40 ≈ $267). Different pairs, different pip sizes, one formula.
3. Write five sentences — one per unit theme, plus one on what a currency price cannot tell you on its own. If the fifth says you are looking at two economies at once and cannot see which moved, you have understood the course.

Checkpoint quiz next, then the courses that build on this: what moves exchange rates, forwards and carry, and how FX risk is hedged. Nothing here recommends holding, buying or avoiding any currency, and nothing forecasts where any rate will go. You have learned how the machinery works and how to read what it prints — a skill, not a signal.