Can someone explain the trade filter thing

[Jaffz]

I can only get it to show the profit margin for explosives. None of the other commodities

Argh

 

[Kaocraft]

If you're talking about in the galmap, it will only show one commodity at a time and you have to pick the chosen commodity from a drop down menu in the filters. If you're at the commodity market in a station, then it should show profit margins for any commodity that can be sold at your destination station. If the item in question is illegal at that location, or in such low demand that it would sell at a loss, then no profit info will show up for it.