Why Can Online Forex Trading Run Around the Clock?
Online forex trading refers to financial activities involving currency exchange or buying and selling through internet channels. To understand why it can operate almost continuously, it is necessary to look at the underlying structure of the forex market: it has no unified centralized exchange, but is an over-the-counter market connected by major financial centers around the world through electronic networks. For this reason, when one time zone’s market closes, another time zone’s market takes over, forming a continuous quotation cycle.
How Did the Floating Exchange Rate System Shape Today’s Forex Market?
The high level of activity in the modern forex market is closely related to historical changes in exchange rate systems. The Bretton Woods system established after World War II adopted a fixed exchange rate arrangement, under which national currencies were pegged to the US dollar and the US dollar was pegged to gold, leaving very limited room for exchange rate fluctuations. As this system collapsed in the early 1970s, major economies gradually shifted to floating exchange rates. Exchange rates began to be determined by market supply and demand, and both the magnitude and frequency of fluctuations increased significantly. Forex trading therefore evolved from a simple need for trade settlement into a massive financial market. According to periodic statistics from theBIS, forex is one of the most liquid markets in the world.
Where Does the Spread Between Spot Remittance Rates and Cash Rates Come From?
Many people mistakenly believe that the same currency has only one price. In reality, bank exchange rates distinguish between "spot remittance" and "cash". Spot remittance refers to electronic foreign currency held in an account, and its exchange is a spot transaction that is usually settled within two business days, commonly known in market practice as T+2 settlement. Cash refers to physical foreign currency notes. Banks need to bear storage, cross-border transportation, and insurance costs for cash, so the cash buying rate is often lower than the spot remittance rate. This spread is not set arbitrarily by banks, but reflects the real cost of handling physical cash. This is also why large currency exchanges usually tend to use spot remittance.
What Determines Exchange Rates?
Exchange rate formation is a process driven by multiple factors. Economists have proposed several classic theories to explain the relative prices between currencies from different angles. Understanding these theories helps investors grasp the logic behind long-term exchange rate trends rather than focusing only on short-term fluctuations.
What Does Purchasing Power Parity Explain?
Purchasing Power Parity (PPP) is one of the basic theories used to explain long-term exchange rates. Its core idea can be summarized as follows:
Under ideal conditions without transaction costs and trade barriers, the exchange rate between two currencies should tend to equalize the price of the same basket of goods in both countries.
In other words, if prices in one country remain persistently higher than in another, its currency theoretically faces depreciation pressure over the long term. This theory explains long-term trends, but has limited explanatory power for short-term fluctuations.
How Do Interest Rates and Capital Flows Affect Exchange Rates?
In addition to price levels, interest rate differences are also an important variable affecting exchange rates. Interest rate parity theory states that under conditions of free capital movement, the interest rate differential between two currencies should match the premium or discount in their forward exchange rates; otherwise, risk-free arbitrage opportunities may arise. Economist John Maynard Keynes discussed this mechanism in his workA Tract on Monetary Reformin 1923. In practice, when a country raises interest rates, it often attracts international capital seeking returns, providing temporary support for its currency. However, this effect is constrained by market expectations and risk appetite.
What Is the Difference Between Online Currency Exchange and Counter Exchange?
After understanding how exchange rates are formed, the differences between the two currency exchange channels become clearer. Both are essentially currency exchange, but the main differences lie in efficiency, cost, and information transparency.
| Comparison Dimension | Online Currency Exchange | Counter Exchange | Main Difference |
|---|---|---|---|
| Processing Method | Remote operation by computer or mobile phone | Visit a branch and wait in line | Online exchange saves travel time |
| Service Hours | Usually supports around-the-clock submission | Limited by business hours | Settlement still follows business days |
| Quotation Level | Spreads are usually more favorable | Preferential pricing is relatively limited | Online exchange has a clear cost advantage |
| Information Transparency | Real-time trends and transaction details | Relies on information provided by branch staff | Online exchange makes comparison easier |
How Do Trading Characteristics Differ Across Currencies?
Forex is not limited to the US dollar. Different currencies show different trading characteristics due to differences in economic fundamentals and liquidity. Common categories include major currency pairs, cross currency pairs, and commodity currencies closely linked to commodity markets.
| Currency Category | Representative Currencies | Liquidity and Spread | Main Volatility Drivers |
|---|---|---|---|
| Major Currencies | US dollar, euro, Japanese yen | High liquidity and narrow spreads | Interest rates and macroeconomic data |
| Cross Currency Pairs | EUR/JPY and others | Medium liquidity | Relative fundamentals of the two economies |
| Commodity Currencies | Australian dollar, Canadian dollar | Higher volatility | Commodity prices |
| Emerging Market Currencies | Some regional currencies | Lower liquidity | Capital flows and policy changes |
Regulatory Framework and Risk Constraints
Due to the complexity of forex-related products, major global regulators impose restrictions on leveraged retail forex and contracts for difference. Taking the European Securities and Markets Authority as an example, since 2018 it has imposed tiered leverage limits on retailCFDpositions: 30:1 for major currency pairs, and 20:1 for non-major currency pairs, gold, and major equity indices. It also requires an approximately 50% margin close-out rule and a negative balance protection mechanism. Regulatory frameworks in the UK, Australia, and other regions are similar in principle. The shared objective of these rules is to limit potential losses amplified by leverage and protect retail investors with limited risk tolerance.
For users who only conduct online currency exchange, leverage is not involved, but they are still subject to foreign exchange administration and anti-money laundering requirements. Personal currency exchange usually has daily and annual limits, and amounts exceeding those limits may require declaration or counter processing.
Online Forex Trading FAQ
Why can the forex market trade continuously for 24 hours?
Because the forex market is a global over-the-counter market without a centralized exchange, connected by major financial centers through electronic networks. The Asia-Pacific, European, and American sessions connect with one another in time. When one region closes, another opens, forming nearly continuous quotations during business days.
What does T+2 settlement mean?
T+2 is a common settlement convention for spot forex transactions. It means that funds are settled on the second business day after the transaction date, or T day. It is a standard settlement cycle formed over time in the market, facilitating interbank clearing and reconciliation across time zones. Spot remittance exchange within accounts usually follows this convention.
Can purchasing power parity be used to predict short-term exchange rates?
No. Purchasing power parity mainly explains long-term exchange rate trends, namely how differences in price levels affect the relative value of currencies. Short-term exchange rates are driven by many factors, including interest rate expectations, capital flows, risk appetite, and unexpected events, and may deviate from the level implied by purchasing power parity for extended periods.
Why do regulators restrict forex leverage?
While leverage magnifies potential returns, it also magnifies potential losses. Retail investors may suffer losses beyond their principal due to small adverse price movements. By setting leverage caps, margin close-out rules, and negative balance protection, regulators aim to control systemic risk and protect individual investors with limited risk tolerance.
