A demonstration on a fictional property. Nothing here is a real organization, and nothing on this page affects nDiligence or any site you use.
What to do. Check the board and your own book, then sell the positions or hold them.
Scripted run. This walkthrough is playing itself. You are not driving it, and what it does next was decided in advance.
Northgate Markets: a crash that only existed on one screen
A trader watches a board. One component in the page draws all of it — the index chart, fourteen last prices, fourteen day changes, fourteen sparklines, and the desk's own profit, margin and risk figures. When that component is swapped, fifty values change in a single repaint and every one of them agrees with every other one.
The session up to 15:36 is left exactly as it was, which is what makes the last twelve minutes believable: nothing about the shape of the morning contradicts them. The fall is drawn as a curve that steepens rather than a straight line, because a straight line down reads as a broken feed and a steepening one reads as selling begetting selling. Three wire headlines arrive that no venue published, to make the shape on the chart legible as an event. And the one row that would have disagreed — a cross-venue check comparing the same instruments across three markets — is not defeated or bypassed. It is simply not drawn, and nothing about a row that is absent draws the eye.
What makes this demonstration different from every other value swap on the site is what happens next. Everywhere else the lie stays a lie: the tanker was always in the fairway, the drones were never in the sky. Here the victim's own reaction reaches back into the world. A trader who sells a twelve-million-dollar book at market moves real prices; other participants' stops trigger on that movement; and a genuine dislocation appears in a market that was flat two minutes earlier. The fabricated crash does not stay fabricated.
Afterwards the reconciliation is the hardest in the suite. The exchange tape proves exactly what the market did. Every fill proves exactly what was traded. The orders were the trader's own, correctly routed and correctly executed at the real market. There is no defective artifact anywhere — no bad fill to dispute, no feed fault to find, no malicious file to scan. What nobody has is a copy of the screen the decision was made on. On the record, a trader simply sold.