What it means
Many markets spend long periods moving sideways. The price falls to a level where buyers step in, rises to a level where sellers appear, and then repeats.
The lower level is called support and the upper level is called resistance, and together they form the range. A range-bound trader buys near support and sells near resistance, collecting the difference on each swing.
Some also place a protective order just outside the range, so that if the price breaks out the loss is limited. Without that discipline a single breakout can wipe out many small gains.
For a business person, the idea is useful beyond trading. A treasurer watching a currency that has held steady for months may decide to convert money near the favourable end of the range, and a buyer of a commodity may time purchases near the low end.
In each case the decision depends on the range continuing to hold. The main risk is the breakout.
Ranges often end suddenly when news, earnings or policy changes shift the balance between buyers and sellers, and the price can run well past the old boundary. Costs also matter, because frequent trades incur commissions and the spread (the gap between the buying and selling price), which can eat a thin profit.
The nuance is that a range is only visible in hindsight and has no guarantee of continuing. Traders usually confirm a range with several touches of each boundary and avoid acting when the range is too narrow to cover costs.
Position size is the other discipline that keeps this approach safe. Because each swing earns only a few per cent, traders who bet too large a share of their capital can lose months of profit on one failed trade.
Many cap the amount at risk on any single trade to a small, fixed fraction of the account.
In practice
Real-world examples.
Example
A currency trader sees that an exchange rate has moved between two levels for six months. She buys near the lower level and sells near the upper one, taking profits on each swing. When news pushes the rate through the top of the range, she closes the position at a small loss.
Example
A company treasurer notes that a commodity the firm buys each month has traded in a narrow band. The treasurer schedules larger purchases when the price is near the low end of the band. The average cost per tonne falls below the cost of buying evenly each month.
Example
An investor holds a stock that has sold off and then settled between $20 and $25. She sells part of her holding near $25 and buys it back near $20. This increases the number of shares she owns without adding new cash.
Formula
Calculation
Net profit per round trip = (sell price - buy price) x number of shares - total trading costs
A trader notices that a share has bounced between $48 and $52 for several months. She buys 1,000 shares at $48.50 and sells them at $51.50. The gross gain is (51.50 - 48.50) x 1,000 = 3.00 x 1,000 = $3,000. After $40 of total trading costs, the net profit is 3,000 - 40 = $2,960.Case study
Seen in the real world.
Greenhaven Treasury is an illustrative, fictional fund that managed $10,000,000 of short-term surplus cash for a group of small businesses. One of its holdings, a commodity-linked security, had traded between $90 and $100 for eight months.
The fund manager traded a $1,000,000 position around that range, buying at about $91 and selling at about $99 on three separate swings. Each swing earned roughly 8.8% on the amount deployed, before costs.
On the fourth trade, a supply announcement pushed the price down to $85, well outside the range, and the manager exited at the stop level of $89. Each good swing earned about $88,000 on the $1,000,000 position, or about $264,000 in total, and the stopped-out trade lost about $22,000, so the net result was still strongly positive. The illustrative lesson is that small repeated gains can be erased by a single breakout unless the exit rule is respected.
Watch out
Common mistakes.
- Assuming the range will last forever, when a breakout can occur without warning.
- Ignoring trading costs, which can erase the profit when the range is narrow.
- Trading without a stop-loss level, which turns a small, planned loss into a large one.
Questions
People also ask.
How do I identify the range?
Look for a price that has turned back from roughly the same high and low at least two or three times, though no pattern is guaranteed to hold.
Is range-bound trading suited to long-term investors?
Rarely, because it needs frequent monitoring and works best over short to medium periods.
What is a breakout?
It is a move of the price beyond the top or bottom of the range, often on higher trading volume, which signals that the pattern may have ended.
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