Paper trading cannot validate a live decision process

Rehearsal without capital at risk

Paper trading is the rehearsal of a trading procedure by recording hypothetical entries, exits, and abstentions without deploying capital. In the archive account, rehearsal trading means tracking those hypothetical trades in order to practice a procedure while no capital is at risk.

The record is a practice book, not a live mark-to-market path. What it can show is whether a written procedure can be followed when nothing is lost or gained on each tick.

When recorded fills are not live fills

The archive notes that rehearsal later moved from handwritten logs to electronic platforms. Even then, balances can be reset and fills can be estimated optimistically, so recorded results can diverge from an honest execution path.

A demo environment is a synthetic venue that lets orders be practiced without live counterparties or real mark-to-market pressure. Demo venues are described as synthetic imitations: similar to live markets, not identical.

Fill realism is whether a recorded price would have been accepted by a live participant at that moment. Rehearsal software cannot know whether a live counterparty would accept an option away from the quoted bid or ask, so reported option fills and slippage can be unrealistic.

Stop and limit orders placed in a non-live futures environment may not indicate how the same orders would execute in a live book. Those conditions sit inside the execution constraint: order type, bid-ask acceptance, and slippage a decision process must survive.

Review timing and missing pressure

Checking cadence is how often prices and open risk are inspected during the holding period. Infrequent or end-of-day review of a rehearsal book can hide large intraday swings that would have changed intra-trade decisions if capital were at risk.

Emotional load is the effect of live gains and losses on entry, exit, and stand-aside choices. The archive identifies that pressure as the largest gap. Without real profit and loss on each tick, rehearsal operators can stay detached, take larger risks, and avoid panic.

No reliable measured link is given between rehearsal-account results and live-account results. Overconfidence transfer is the reading of rehearsal results as proof that the same rules will be followed with money at risk. Rehearsal success is argued to invite that overconfidence before live trading begins.

In this view, rehearsal is useful only briefly as skill practice, and rehearsal success has little bearing on later live adherence to the same rules.