Currency exchange has always existed — organised trading is different
Forex (Foreign Exchange) is simply the market for exchanging one currency for another. In its most basic form, it has existed since ancient civilisations traded across borders and needed a way to value one currency against another. When a Roman merchant traded with a Persian, some agreed-upon exchange rate was required. Modern forex is this same fundamental mechanism, scaled to global capitalism and accelerated by electronic markets.
Organised forex trading at scale began with the Bretton Woods Agreement of 1944, which pegged global currencies to the US dollar and the dollar to gold at $35/ounce. When President Nixon ended the dollar's gold convertibility in 1971 (the "Nixon Shock"), currencies began floating freely against each other — creating the modern forex market where exchange rates are determined by supply and demand. Today the BIS (Bank for International Settlements) estimates $7.5 trillion is exchanged daily, making forex the largest financial market in the world by an enormous margin — larger than all global stock markets combined.
Forex as the foundation of global commerce
Unlike stock markets (which exist primarily for investment and capital raising), forex exists because every cross-border economic transaction requires it. When Boeing sells aircraft to Singapore Airlines priced in dollars, Singapore Airlines must convert Singapore dollars to USD. When a Japanese pension fund buys US Treasury bonds, yen must be exchanged for dollars. When an oil-producing nation receives USD payment for crude (oil is priced in dollars globally), and then pays domestic government workers in local currency, forex is required. This structural economic necessity — not financial speculation — is the primary driver of forex volume. The BIS estimates that genuine speculative trading represents well under half of total daily volume.
The BIS 2022 Triennial Survey found $7.5 trillion trades in the forex market daily. The entire US stock market (NYSE + NASDAQ combined) typically sees $400–$500 billion in daily volume. What structural features of forex explain why its volume is so much larger than equity markets?
Who actually moves forex markets
The forex market is often advertised to retail traders, but retail participation represents less than 5% of total volume. The market is primarily institutional. Understanding who drives price moves is essential for any trader:
Set monetary policy (interest rates), intervene directly in currency markets when needed. Most powerful single actors — a central bank can move a currency 5–10% in hours by buying or selling billions in the open market.
Example: Bank of Japan spent ¥2.8 trillion in September 2022 buying JPY — USD/JPY fell 5% in minutes.
Execute forex for clients (corporations, fund managers), trade for their own accounts, and act as market makers providing liquidity. The top 10 banks (JPMorgan, Deutsche Bank, Citi, UBS) handle ~70% of global forex volume.
Example: When a multinational pays its overseas suppliers, it calls its corporate bank — which routes the trade through the interbank market.
Convert revenue and costs between currencies as part of international operations. A company with costs in EUR and revenue in USD must constantly manage this FX exposure through hedging or spot conversion.
Example: Airbus converts billions of USD aircraft sale proceeds to EUR quarterly to pay European suppliers.
Speculate on macro trends and hedge currency exposure in international portfolios. Some of the largest single daily moves are caused by large hedge fund position building.
Example: George Soros's Quantum Fund famously shorted £10 billion of GBP in 1992, breaking the Bank of England and earning $1 billion in profit.
Individuals trading through online brokers. Less than 5% of volume but growing. Access the interbank rate through broker intermediaries who add a spread.
Example: A trader with a £5,000 account trading EUR/USD via IG, XTB, or Oanda.
The 24-hour market — sessions and when to trade
Because forex has no central exchange, it operates across overlapping time zones. Different sessions have dramatically different volume and spread characteristics. For retail traders, this matters practically: spreads are tightest and liquidity is highest during active sessions, while spreads widen significantly during quiet periods.
London/New York overlap (roughly 1pm–5pm GMT) has the highest volume and tightest spreads.
From quote to position — the retail trading flow
A retail forex trader accesses the market through an online broker (IG, XTB, Pepperstone, OANDA, etc.). The broker provides a trading platform showing live bid/ask prices for currency pairs, connects to the interbank market for price feeds, and acts as either a market maker (taking the other side of trades) or an STP/ECN broker (passing orders directly to liquidity providers). Retail brokers make money through the bid-ask spread — the difference between the buy and sell price — and overnight financing fees.
When you see EUR/USD quoted at 1.0849/1.0850, you can buy at 1.0850 (the ask) or sell at 1.0849 (the bid). The 1-pip spread ($1 on a mini lot) is the broker's compensation for providing this access. If EUR/USD rises to 1.0900, you close by selling at 1.0899/1.0900 (bid) — your profit is 1.0899 − 1.0850 = 49 pips. Most retail accounts use margin/leverage: you deposit £1,000 and can control a £10,000 or £30,000 position, depending on the leverage ratio. Article 4 in this section covers leverage and position sizing in full detail.
- • 24 hours Mon–Fri (with session gaps)
- • OTC — no central exchange
- • Price speculation only — no ownership
- • Drivers: interest rates, macro, central banks
- • Zero positive long-run expected return without edge
- • 70–80% of retail traders lose money
- • Fixed market hours (9:30–4pm typical)
- • Central exchange (NYSE, LSE, etc.)
- • Ownership stake in a business
- • Drivers: corporate earnings, growth, rates
- • Positive long-run expected return from earnings growth
- • Diversified index investing has strong long-run track record
Retail forex traders represent less than 5% of total forex volume, with institutional participants (banks, central banks, corporations, hedge funds) making up the other 95%+. What is the key implication of this for retail traders?