1994issue C061-6
Bound small-account risk before adding leverage
Treat account size as a hard filter on stop type, contract count, and payoff shape. Cap the cash one fill can take, lock the number of contracts so that cap cannot drift, then require a winner multiple large enough that a modest hit rate still pays for the losers.
- Cap the cash lost on one fill first, so a short run of bounded losses cannot shrink equity until the next trade cannot be placed.
- Use fixed contract sizing so the planned dollar stop stays a known share of equity and does not expand when a market-generated stop sits farther from entry.
- Require a risk-reward ratio of at least 2.5 to 1 so a 45% to 50% hit rate can still pay for losers, instead of high accuracy with an inverted payoff.
- On a small account, extra markets consume capital and can extend a run of small losses, which raises risk of ruin even when the book looks more spread out.
Account size as a hard filter
Editorial framing, not an archive claim: decide the stop type, the contract count, and the payoff shape from account size before leverage is added. First cap the cash that one fill can remove. Then lock how many contracts that cap may cover. Then require a planned winner large enough that a modest hit rate still covers the losers.
Risk of ruin is the chance that a run of individually bounded losses shrinks equity until the account can no longer place the next trade. The archive workflow bounds that chance before entry and keeps the same bound in force while the position is open.
Cap the cash lost on one fill
A market-generated stop sits at prior price structure, so the cash at risk changes with how far price has already traveled from the last turn. Those exits can place anywhere from a few hundred to several thousand dollars of initial risk on a single contract, depending on that distance.
Keeping that initial risk under 1% of equity while still using those wide exits implies account floors in the $300,000 to $500,000 range. Position-style exits of $2,000 to $3,000 per loss can exhaust an account below $100,000 after relatively few losers, which is why that account size cannot pay for market-generated, multi-thousand-dollar initial risk.
A dollar-generated stop sets the first loss to a chosen cash amount rather than a price landmark. Containing initial risk per trade to a few percent of equity, illustrated as a $400 stop per contract, is presented as the condition that keeps ruin potential low on a small account.
Lock the contract count
Fixed contract sizing chooses a set number of contracts so the planned dollar stop maps to a known share of equity and does not expand when the chart stop sits farther from entry. A large account can vary contract count to hold risk roughly constant as stop distance changes.
Editorial note: a small account does not have that slack, so the contract count has to stay fixed once the cash cap is set. A sizing heuristic given for full-sized contracts is about one market complex per $10,000 of equity.
When extra markets raise ruin risk
Professional programs often pair diversification with low relative leverage so that wide, market-based exits still keep drawdowns contained. Relative leverage is how large the position is versus equity after stop distance is counted, not merely the face value of the contract.
On a small account, spreading across many markets adds a real opportunity cost of diversification. Each extra position consumes capital, and a trendless stretch can produce a longer-than-average run of small losses. That capital and attention would otherwise fund fewer, better-bounded positions.
Require a paying winner multiple
The risk-reward ratio is the planned size of a winning outcome relative to the planned initial loss on the same trade. A 45% to 50% hit rate paired with a profit-to-loss multiple of at least 2.5 to 1 is offered as an alternative to high accuracy with an inverted payoff, in which average winners are smaller than average losers.
Raising contract count or leverage on short-horizon trades can restore payoff size, but it also lets one loss erase a string of small gains. Editorial reading: do not add that leverage until the cash cap, the fixed contract count, and the payoff multiple are already in place.
All readings on this track · 7 readings
- 1987Volatility-layered mechanical system with fixed contracts
- 1994Starting capital from worst-case portfolio walk-forwards
- 1994Bound small-account risk before adding leverage
- 1996Variable position size after entry
- 1996Equity path filters for contract size and drawdown
- 1997Stop distance, equity caps, and trading halts
- 1999Size-matched buy-and-hold evaluation for stock systems