Understanding Forex Market Structure and Participants
The foreign exchange market is the largest and most liquid financial market in the world, with an estimated daily turnover of over $7 trillion. Understanding how it's structured — who participates, how prices are formed, and why it behaves differently from exchange-traded markets — is foundational to any forex education.
OTC versus exchange-traded markets
Most financial markets most people are familiar with — stock exchanges, futures markets — are centralised. There is a single exchange (or a small number of them) that matches buyers with sellers. Every participant sees the same price at the same time, and all transactions flow through a central order book.
Forex is different. It is an over-the-counter (OTC) market, which means there is no central exchange. Transactions occur directly between participants, facilitated by a global network of banks, brokers, and electronic communication networks. There is no single "forex exchange" where all trades are registered.
This has practical implications for price. Because there is no central order book, different participants may see slightly different prices at any given moment. The price your broker shows you is the price they're offering, based on their own liquidity sources. This is why bid-ask spreads can vary between brokers for the same currency pair.
The market hierarchy
Forex market participants exist in a hierarchy based on the size and directness of their market access:
- Tier 1 banks (interbank market): The largest commercial and investment banks — JP Morgan, Deutsche Bank, Barclays, Citi, and others — trade directly with each other in what's called the interbank market. They have access to the tightest spreads and the deepest liquidity. This is the core of the forex market.
- Institutional participants: Hedge funds, asset managers, sovereign wealth funds, insurance companies, and pension funds trade at the institutional level, typically accessing the market through Tier 1 banks or prime brokerage arrangements.
- Corporations: Multinational businesses trade forex to manage the currency exposures that arise from international operations — converting revenues, paying suppliers in foreign currencies, or hedging future cash flows.
- Retail brokers and their clients: Retail traders access the market through brokers who aggregate liquidity from higher-tier sources and provide it to individual clients. The spreads and execution quality available to retail participants reflect this intermediation.
How prices are formed
Currency prices move because of the relative supply and demand for one currency versus another. When more participants want to buy euros than sell them (relative to US dollars), the price of EUR/USD rises. When more want to sell, it falls.
This supply and demand is driven by a wide range of factors: interest rate expectations, economic data releases, geopolitical events, capital flows from institutional investors, corporate hedging activity, and retail speculation. At any given moment, the market price represents the collective best estimate of these forces across all active participants.
This is why fundamentals and technicals can both have merit as analytical frameworks. Fundamentals describe the economic forces driving demand for a currency. Technicals describe the pattern of how market participants have collectively responded to those forces in the past, and what patterns may be repeating.
Liquidity and trading sessions
Unlike stock markets with defined opening and closing times, forex operates 24 hours a day, five days a week. This is because different financial centres around the world are active at different times — Sydney, Tokyo, London, and New York overlap to create a near-continuous market.
However, not all hours are equal. Liquidity — the ease with which you can buy or sell without significantly affecting the price — varies significantly throughout the day. The London session (8am–5pm GMT) and the New York session (1pm–10pm GMT) are the most liquid, and their overlap period (1pm–5pm GMT) typically sees the highest trading volume and the tightest spreads.
The Sydney and Tokyo sessions are generally lower-liquidity periods. Currency pairs involving Asian currencies (like USD/JPY, AUD/USD, or NZD/USD) tend to be more active during the Asian session. EUR/USD and GBP/USD are typically most liquid during London and New York hours.
Bid, ask, and the spread
When you look at a forex quote, you'll see two prices: the bid (the price at which the market will buy from you) and the ask (the price at which the market will sell to you). The difference is the spread.
The spread is effectively the cost of entry for a trade. Major pairs like EUR/USD typically have very tight spreads — sometimes as low as 0.1 pips — while exotic currency pairs involving less-traded currencies can have spreads of 10 pips or more. This difference reflects the liquidity available in each market: more liquid pairs have more buyers and sellers, which compresses the spread.
Understanding that the spread represents an immediate cost — you are behind by that amount the moment you enter a trade — is important context for position sizing and trade planning. A strategy that targets 5 pip moves is fundamentally different from one targeting 50 pip moves when factoring in a 2 pip spread.