Buying and Selling Currencies
Every forex transaction involves the simultaneous purchase of one currency and the sale of another. This is why currencies are always quoted in pairs — for example, EUR/USD or GBP/JPY. The first currency in the pair is called the base currency, and the second is the quote currency. The price of the pair tells you how much of the quote currency is needed to purchase one unit of the base currency.
If EUR/USD is quoted at 1.0850, it means one euro costs 1.0850 US dollars. If you believe the euro will strengthen against the dollar, you would buy EUR/USD (go long). If you believe the euro will weaken, you would sell EUR/USD (go short). Your profit or loss depends on how the exchange rate moves after you open your position.
Bid and Ask Prices
When you look at a forex quote, you will always see two prices: the bid and the ask (also called the offer). The bid is the price at which the market is willing to buy the base currency from you — it is the price you receive when you sell. The ask is the price at which the market is willing to sell the base currency to you — it is the price you pay when you buy.
For example, if EUR/USD is quoted as 1.0848 / 1.0850, the bid is 1.0848 and the ask is 1.0850. The difference between these two prices — 0.0002, or 2 pips — is called the spread. The spread represents the primary transaction cost in forex trading and is how brokers earn revenue on each trade.
When you open a buy trade, you enter at the ask price and exit at the bid price. This means you start every trade slightly in the negative by the amount of the spread. For your trade to become profitable, the price must move in your favor by at least the spread amount.
Market Makers vs ECN
The way your orders are executed depends on the type of broker you use. There are two primary execution models in retail forex: Market Maker (also called Dealing Desk) and ECN/STP (Electronic Communication Network / Straight Through Processing).
A Market Maker broker acts as the counterparty to your trades. When you buy, the broker sells to you; when you sell, the broker buys from you. Market makers set their own bid and ask prices and profit from the spread. The advantage is that they can offer fixed spreads and guaranteed order fills, even in volatile markets. The potential downside is a conflict of interest — the broker profits when you lose. Reputable market makers manage this risk by hedging their exposure in the interbank market.
An ECN/STP broker routes your orders directly to liquidity providers — banks, hedge funds, and other institutional participants. You trade at the best available bid and ask prices from the pool of liquidity providers. Spreads are typically variable and can be extremely tight (sometimes as low as 0.0 pips on EUR/USD), but the broker charges a commission per trade. ECN brokers have no conflict of interest because they earn revenue from commissions rather than from your losses.
Order Types
Understanding order types is essential for executing your trading strategy effectively. The three fundamental order types in forex are market orders, limit orders, and stop orders.
Market Orders
A market order is an instruction to buy or sell immediately at the best available price. It guarantees execution but not the exact price — in fast-moving markets, the price you receive may differ slightly from the price you saw when you clicked the button. This difference is called slippage and can be positive or negative.
Limit Orders
A limit order is an instruction to buy or sell at a specific price or better. A buy limit is placed below the current market price — you want to buy at a lower price. A sell limit is placed above the current market price — you want to sell at a higher price. Limit orders guarantee the price but not execution; if the market never reaches your specified price, the order will not be filled.
Stop Orders
A stop order becomes a market order once a specified price level is reached. A buy stop is placed above the current price and triggers when the market rises to that level — commonly used to enter breakout trades. A sell stop is placed below the current price and triggers when the market falls to that level. The most important stop order is the stop-loss, which automatically closes a losing position at a predetermined level to limit your risk.
Leverage and Margin
Leverage allows you to control a position much larger than your account balance. It is expressed as a ratio — for example, 100:1 leverage means you can control $100,000 worth of currency with just $1,000 of your own capital. The $1,000 you put up is called the margin, and it acts as a good-faith deposit to cover potential losses.
While leverage magnifies potential profits, it equally magnifies potential losses. If you use 100:1 leverage and the market moves 1% against you, you lose 100% of your margin. This is why brokers enforce margin calls — if your account equity falls below the required margin level (often 50% or 100% of used margin), the broker will either alert you to deposit more funds or automatically close your positions to prevent further losses.
As a general rule, experienced traders rarely use more than 10:1 to 20:1 effective leverage, even if their broker offers much higher ratios. Conservative leverage combined with proper position sizing is one of the cornerstones of long-term trading success.
Long vs Short Positions
Going long means buying the base currency because you expect it to appreciate. Going short means selling the base currency because you expect it to depreciate. In forex, shorting is just as straightforward as going long — there are no special borrowing requirements or uptick rules as in some stock markets.
For example, if you believe the US dollar will strengthen against the Japanese yen, you would sell (short) USD/JPY... actually, you would buy USD/JPY because the dollar is the base currency. If you believe the dollar will weaken, you would sell USD/JPY. Always remember: buying the pair means you are bullish on the base currency; selling the pair means you are bearish on the base currency.
Key Takeaways
- Every forex trade involves buying one currency and selling another simultaneously.
- The bid price is what you receive when selling; the ask price is what you pay when buying. The difference is the spread.
- Market Maker brokers act as counterparty and offer fixed spreads; ECN brokers route orders to liquidity providers with variable spreads plus commission.
- The three core order types are market orders (instant execution), limit orders (specific price), and stop orders (triggered at a price level).
- Leverage lets you control large positions with small capital, but it amplifies both gains and losses equally.
- Going long means buying the base currency (bullish); going short means selling it (bearish).
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