Ships Fleet carrier question

I have a question about how the commodities market works on a FC. can you simultaneously put up a buy order and a sell order for goods? Example, can i set it to buy bromellite for 90% of galactic average while also selling it for 120% of galactic average? Im wondering if you can create a market place where commodities are both bought and sold in a way that the carriers inventory fluctuates organically based on player supply/demand.
 
My next question is what happens if i put out a buy order for a billion credits worth of osmium but i only have 700 million onboard the carrier? Can it go negative to fill the order or will it stop buying once available funds are depleted?
 
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