What is trade copier?

What it means

Copiers are used for managing several accounts from one signal source, for copy-trading services, and by traders running the same system across multiple prop firm accounts. Position sizes are scaled by balance or by a fixed ratio.

Why it matters

Every copier introduces latency and therefore slippage between master and slave, and the effect is worst on exactly the fast entries where timing matters most. A strategy with a small edge can have that edge consumed entirely by copier slippage across several hops.

What this changes in practice

Prop firms often restrict or prohibit copying between accounts, particularly copying the same trades across multiple funded accounts, and violations are treated seriously. Check the specific firm's rules rather than assuming — see prop firm rules.