Trend following is a rules-based approach that responds to price movement rather than trying to predict every turning point. A system may enter after a breakout, stay in while the trend continues, and exit when its rules say the trend has weakened. The approach can also produce repeated losses when prices move sideways; no rule guarantees a profit.
Richard Donchian and systematic trading
Richard Donchian is widely associated with the development of systematic trend-following methods. The source article presents his approach as emphasizing price behavior, discipline, risk controls and allowing a position to remain open while a trend persists. Its discussion also connects Donchian with breakout rules, moving averages and the use of written trading systems.
Donchian Channels and breakout rules
A Donchian Channel displays the highest high and lowest low over a selected lookback period. The source describes a 20-day channel as a common example. A system may treat a move beyond the prior range as a breakout signal, then use separate rules to manage or exit the position. The chosen market, lookback period, price basis and exit rule should be stated explicitly; different implementations can produce different results.
The four-week rule
The source article describes a four-week rule based on closing prices over a four-week period. Treat this as one historical ruleset, not a universal entry signal. A trader evaluating it would need to define the contract, data, entry and exit timing, position size, fees and slippage before testing it.
Moving averages as a filter
A moving average can be added to summarize recent prices or filter signals. It does not remove uncertainty, and adding indicators can make a system more complex without improving results. Any filter should be tested on data that was not used to design the rule.
The Turtle Trading approach
The source also discusses the Turtle Trading System as an example of a rules-based breakout approach using entry and exit conditions with money-management rules. It should be understood as a particular system with defined parameters, not as proof that every breakout strategy works or that past examples can be repeated.
Risks and limitations
- Sideways or rapidly reversing markets can produce repeated false breakouts.
- Signals may arrive after a large part of a move has already occurred.
- Gaps, slippage, commissions, contract specifications and position sizing affect actual results.
- Leverage can magnify losses; a stop order may not fill at the expected price.
- A backtest does not guarantee future performance and can be distorted by overfitting.
The CFTC warns that commodity futures and options are volatile and risky, and that individuals can lose all their money or more than their initial investment. Read the CFTC’s Futures Market Basics before considering derivatives. This article explains concepts; it is not an investment recommendation.
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