Queue Priority

In price-time priority markets, orders at the same price fill in the order they arrived. Earlier orders have higher fill probability.

1 min

Why it matters

Queue position changes execution outcomes. Late orders may not fill at all; early orders may be first to get hit by informed flow.

Trading use: the point is not vocabulary. The point is prediction: what changes when this shows up?

Common trap

Assuming a limit order guarantees a fill or guarantees price improvement.

Example

You join the bid after a long queue formed. Price touches your level and bounces, but you never get filled.

Operational cue: if you can’t point to it on the chart, in the DOM, or in your broker logs, treat it as a story and trade smaller.

Notes

If you see this repeatedly, you are in a different regime than your model assumes.
Regime change usually means position size change.
When in doubt: trade smaller, or don’t trade.