Sizing, stops and staying in the game

Staying in the game comes first

Every trading approach has losing trades and losing stretches. What separates a setback from the end of an account is arithmetic, and the arithmetic is unforgiving. An account that falls by half has to double just to get back to where it started. A small fall needs only a small recovery; a large one can take years to repair.

That asymmetry is why risk discipline comes before everything else. The first job of any set of rules is to limit how much a single trade, or a bad run of trades, is allowed to cost.

Position size is the real decision

Traders often focus on where to enter. The more important choice is how much to trade. Two traders can take an identical trade, with the same entry and the same exit, and one can lose a sliver of the account while the other loses a large part of it, purely because of size.

A common way to set size starts from the other end. First decide how much of the account a single trade is allowed to cost if its exit is reached. Then measure the distance from entry to that exit. Those two together determine how many contracts to trade, and the size shrinks automatically when the exit has to sit further away.

In futures this matters even more, because leverage means one contract can represent far more value than the margin held against it. Contract size is a choice too: many markets have smaller micro contracts, which allow a position to be sized in fine steps rather than large ones.

A stop is an instruction, not a promise

A stop order tells the market to close a position once the price reaches a chosen level. It turns an exit rule into something that happens without anyone needing to act. It does not fix the price the exit happens at. In a fast market, or when a market opens far from where it closed, the order can be filled well beyond the stop level. This is slippage, and a sound plan allows for it.

Stops also have a cost when they are placed too close: ordinary movement in the price closes positions that would have worked. Choosing where a stop goes is a trade-off between being stopped out often and losing more when wrong, and it belongs in the written rules rather than in the moment.

Rules for the day, not just the trade

Single trades are only part of the picture. Many traders also set rules for a whole day or period: a loss after which trading stops until the next session, or a largest number of contracts that may be open at once across every market. Losing streaks cluster, and the urge to win back a loss quickly is one of the most expensive impulses in trading.

A rule like this does not change what the market does. It changes when the decision about a bad day is made: in advance and calmly, rather than in the middle of one.

One idea wearing several hats

Positions in different markets can still move together. Index futures often rise and fall at the same time, and metals can move together when the same news drives them. Holding several of these at once can be one large bet in disguise. Careful rules look at what open positions have in common, not only at each one alone.

In short

Risk discipline is mostly decided before a trade: how much any one position can cost, where it will be closed, and what happens after a bad day. Writing those down as fixed rules means they are decided calmly and in advance, rather than afresh in the middle of a trade.