Treat a shared mechanical printout as a public script

Matching machines issue the same unload

A mechanical-trading-system is a rule set that converts shared risk-reward, beta, theta, and similar terminal inputs into timed entry, exit, or unload instructions. Operators who feed the same risk-reward, beta, and theta calculations into machines can reach matching selection and timing conclusions, so a sell instruction meets other machines that also read unload.

The form sheet omits the adversary

Indicator readings can be interpreted correctly and still fail because the outcome favored by the form sheet does not always occur. After a decision is taken, price often moves against the expectation, and the factor that rarely appears on the printout is an adversary. An adversary is the opposing interest that acts against a plan once that plan is published or widely copied.

Unlike physical nature, which does not change tested behavior to deny an observer, a widely known market pattern draws unanimity that induces contrary-action. Contrary-action is the reversal that appears when too many participants adopt the same established behavior pattern. A novel method attracts countermoves until the method is neutralized and a new equilibrium is reached.

When the contest becomes fund versus fund

If the public concentrates capital in large funds and managed accounts, the contest shifts from customer versus customer to fund versus fund and can settle into four-decimal stability. A prolonged narrow trading range can leave fluctuation-seeking traders without a usable two-way move on either the upside or the downside. Grid-lock is a state in which many operators reach the same computerized conclusion and two-way fluctuation collapses toward a narrow standoff.

Fluctuation trading is a psychological venture

Trading short-term fluctuations is a psychological venture and is not the same procedure as long-horizon investing based on fundamental research. A trading-psychology-process is a procedure that treats short-horizon fluctuation trading as an attempt to read combined participant intent rather than as a long-horizon fundamental appraisal. The same public tape and terminal data still produce opposed decisions.

A tactic that does not depend on direction

Game-theory is a two-sided decision frame that treats other participants as an adaptive opponent and seeks a tactic usable whichever way price moves. A game-theory tactic for fluctuation traders is to maximize gain and minimize loss regardless of direction, for example by treating seven advances in the last ten sessions as a 70 percent continuation assumption and playing both long and short.

A later game-theory layer is expected, in time, to reach the same grid-lock as earlier computerized methods.