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Martingale, Why Doubling Down Eventually Destroys Accounts

Martingale is a system where you double your position size after each loss, aiming to recover all previous losses with one win. On paper, it seems mathematically clever. In practice, it's one of the fastest ways to blow an account.

Example: you risk $10 and lose. Next trade, $20. Lose again. Then $40, $80, $160. After five losses, your next bet is $320, and total losses are $310. A single win would only bring you back to a small profit.

Why it fails:

- Losing streaks happen. Even a 70% win rate strategy can produce long streaks.
- Account size is finite. You eventually can't afford the next doubling.
- Brokers have limits. Maximum lot sizes and margin requirements stop you.
- Small gains, huge risks. Most of the time you win tiny amounts, but one bad streak erases everything.

Why it's tempting:

- Frequent small wins create a false sense of safety
- Backtests may look excellent until a long losing streak appears

Warning signs in products:

- Automated trading robots with smooth equity curves and high win rates but no stop losses
- Claims of "no losing months"

Safer ideas:

- Fixed or decreasing risk after losses, not increasing
- Strict stop losses
- Realistic expectations about streaks

If a system needs you to increase risk to recover from losses, it carries a hidden cliff.

Avoid the cliff. Survive first, then grow.

Something worth trying if martingale still sounds tempting. Take a coin and pretend each flip is a trade, double the stake after every loss, start at 1 unit with a 100 unit account. Most runs, you'll be fine for a while. Then a string of six or seven losses shows up and the account's gone. It happens faster than people expect.

The arithmetic in your example checks out: 10, 20, 40, 80 and 160 lost is 310, the sixth bet is 320, and a win nets you 10 dollars. Risking 320 to make 10 is the whole problem in one line.

People underestimate how often the bad streak arrives. With a 70 percent win rate, the chance of at least one run of six straight losses is about 22 percent over 500 trades and about 40 percent over 1,000. Seven in a row over 1,000 trades is still around 14 percent. Those are not rare events for an EA that trades several times a day.

In lot terms it gets ugly faster than people expect. Start at 0.01 and ten doublings later you need 10.24 lots, which most small accounts cannot margin, and many brokers cap the maximum order size anyway. News days make it worse, because the losing streak tends to come in one directional move with no pullback for the grid to recover on.

Some people ask what about a softer version, like 1.5x after a loss? It's the same idea, just slower. The core problem is that it raises size exactly when your strategy is struggling. Any system that does that eventually gets caught by a long losing streak. With 1.5x, starting at 1 percent, eight losses in a row means the ninth trade risks about 25 percent of the starting balance, after already losing around 50 percent. Eight losses in a row happens to normal strategies with a 40 percent win rate over a few hundred trades. So it still breaks, just a few months later than full martingale does.