Inside the $6 Trillion Currency Market: How Forex Trading Actually Works

Every morning, before most people have finished their first coffee, currency traders in Tokyo, Singapore, London, and New York have already moved trillions of dollars through the world's largest financial market. The foreign exchange market — forex, or FX — processes more than $6.6 trillion in daily transactions, dwarfing all equity, bond, and commodity markets combined. Yet for most business leaders, it remains one of the least understood financial markets.

The Market Structure

Unlike stock or futures markets, forex operates with no central exchange. Trading occurs directly between participants in what is known as an over-the-counter market, operating 24 hours a day, five days a week, following the sun from Asian markets opening on Monday morning to New York closing on Friday afternoon.

At the apex of the market sit the major global banks — JPMorgan Chase, Deutsche Bank, Citigroup, UBS, Barclays — which together account for roughly 50% of daily trading volume. They provide liquidity to corporations, asset managers, hedge funds, and retail traders, earning the spread between the bid and ask price on each transaction.

Below the banks are electronic communication networks and trading platforms that allow institutional clients to access interbank pricing. Retail forex brokers aggregate this pricing and add their own spread to serve individual traders.

What Moves Currencies

Currency values reflect the relative attractiveness of different economies as investment destinations, filtered through the expectations of millions of market participants making real-time judgements about future conditions.

Interest rate differentials are the single most powerful driver of exchange rates over medium-term horizons. When the Federal Reserve raises interest rates while the European Central Bank holds steady, dollar-denominated assets become more attractive relative to euro assets, drawing capital flows into the US and pushing the dollar higher.

Economic data — growth, inflation, employment, trade balances — influences exchange rates by shaping expectations about future interest rate policy. A stronger-than-expected US jobs report will typically strengthen the dollar because it reduces the probability of Fed rate cuts.

Geopolitical events introduce risk premium into currency pricing. Safe-haven currencies — the Swiss franc, Japanese yen, and to a lesser extent the US dollar itself — typically appreciate in periods of global uncertainty as investors seek the perceived safety of more stable jurisdictions.