OK I made Toilets up hoping to get someone to explain this. 
Here's the situation. I'm on a station and there's a BB mission saying if I can get Gallium to them in 3 hours I'll make 10,000 credits. Cool! But... when I go to the galaxy map, remove all trading lines to just show Gallium to see where it's originating from - when I go to that station there's no Gallium there. You do follow the pulse line right? It pulses in the direction of supply ----> demand?
Here's the situation. I'm on a station and there's a BB mission saying if I can get Gallium to them in 3 hours I'll make 10,000 credits. Cool! But... when I go to the galaxy map, remove all trading lines to just show Gallium to see where it's originating from - when I go to that station there's no Gallium there. You do follow the pulse line right? It pulses in the direction of supply ----> demand?