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Risk management: stop-loss, position size and the all-or-nothing mistake

There is a belief that trading well means calling the direction right. It is not. You can be right more than half the time and still blow up the account, and you can be wrong most of the time and end up positive. What decides it is the size of each bet.

The math that shows no mercy

Losing 50% of your capital requires gaining 100% just to get back to where you started. Losing 20% requires gaining 25%. The asymmetry grows fast, and that is why limiting the loss per trade matters more than maximizing the gain.

Three decisions before you open a trade

  1. How much I am going to risk. A fixed percentage of capital, decided in advance and not renegotiated in the heat of the moment.
  2. Where I get out if it goes wrong. The stop level comes from reading the chart, not from how much you are willing to lose — if the technical level calls for more risk than your limit allows, the answer is to reduce the position, not move the stop further away.
  3. How big the position is. It is a consequence of the first two, not an independent choice.

The all-or-nothing mistake

Putting all your capital into a trade "that cannot possibly go wrong" is the most common pattern behind wiped-out accounts. Not because the analysis was bad, but because no analysis is right 100% of the time — and a single bet does not survive the first exception.

Duotide's context

At a broker with no CVM oversight, as is the case with Duotide, there is no regulatory leverage limit nor any requirement to test whether a product suits your profile. The two safeguards that would exist in the regulated Brazilian market are entirely up to you.

How much you need to gain to recover each loss lose 10% need to gain 11% lose 25% need to gain 33% lose 50% need to gain 100% lose 75% need to gain 300% The asymmetry grows fast — which is why limiting the loss per trade matters more than maximizing the gain.
How much you need to gain to recover each loss

Frequently asked questions

How much should I risk per trade?

The most commonly used benchmark is 1% to 2% of capital per trade. It is not a magic rule: it is what lets you be wrong several times in a row without wrecking the account. At 10% per trade, five losses in a row cut your capital in half.

Does a stop-loss guarantee I won't lose more than that?

Most of the time, yes. On a gap opening or major news, the price can jump past the stop level and the order fills worse — what is known as slippage. The stop limits the risk; it does not eliminate it.