Risk & Money ManagementDoubling-Up SystemProgressive Averaging
Martingale
A position-sizing system that doubles size after every loss so that one eventual win recovers all prior losses plus a unit.
What Martingale means
Martingale originated in eighteenth-century casino betting and reaches forex through automated systems that increase lot size after each losing trade, or that add progressively larger positions at fixed intervals against a losing move in a grid. The sizing sequence runs 1, 2, 4, 8, 16 and onward, and the arithmetic is genuinely correct: whenever a winner finally arrives, it recovers the entire preceding sequence and adds one unit of profit on top.
The flaw is not in the arithmetic but in the assumption of unlimited capital. Exposure grows exponentially while an account is finite, so a long enough losing streak exhausts margin before the guaranteed winner can occur, and losing streaks of ten or more are ordinary rather than exotic. The characteristic result is a long, smooth, attractive equity curve terminated by a single catastrophic stop out. Anti-martingale, which increases size after wins and cuts it after losses, has the opposite and far safer risk profile.
Worked example
Starting at 0.1 lots and doubling after each loss, the tenth trade in a losing sequence requires 51.2 lots and the sequence has committed 102.3 lots in total, far beyond what a 10,000 dollar account could ever margin.
Related terms
- Grid TradingA systematic method placing buy and sell orders at fixed intervals around a price, profiting from oscillation but exposed to trends.
- Risk of RuinThe probability that an account will lose a defined portion of its capital before reaching a chosen profit objective.
- Money ManagementThe set of rules governing how much capital is risked per trade, per day and across all open positions.
- Position SizingThe process of choosing how many lots to trade so that a losing trade costs a predetermined amount of capital.
- DrawdownThe decline from a peak in account equity to a subsequent trough, usually stated as a percentage of the peak.
Frequently asked questions
What does Martingale mean in forex trading?
A position-sizing system that doubles size after every loss so that one eventual win recovers all prior losses plus a unit.
How does Martingale work in practice?
The flaw is not in the arithmetic but in the assumption of unlimited capital. Exposure grows exponentially while an account is finite, so a long enough losing streak exhausts margin before the guaranteed winner can occur, and losing streaks of ten or more are ordinary rather than exotic. The characteristic result is a long, smooth, attractive equity curve terminated by a single catastrophic stop out. Anti-martingale, which increases size after wins and cuts it after losses, has the opposite and far safer risk profile.
What is an example of Martingale?
Starting at 0.1 lots and doubling after each loss, the tenth trade in a losing sequence requires 51.2 lots and the sequence has committed 102.3 lots in total, far beyond what a 10,000 dollar account could ever margin.
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