My suggestion is all about trading, for now, we can trade only in open space by ejecting cargo. I suggest making a market on top of every home station with a nice billboard or whatevs to make it visible. They can or can’t be connected with the tradeable content.
How will it work?
1-You can only trade the stuff you found in your open space session.
2-For starters, credits would be the only currency to participate in buying stuff of lesser value (ores, vouchers, iridium and maybe blueprints).
3-High-value items, could be bought with GS (monos, berries, neo…) so everyone can be happy (players&devs) and we still have a stable economy.
4-Auction option is debatable. maybe good for GS items.
5-Trades are limited per day and by merchant/trading level located in your achievements, meaning, more overall trades=higher achievement level=more trades per day.
6-Costs of blueprints in credits=the cost shown when you find it (no exploit from greedy players, people buy the missing blueprints, everyone is okay) OR spend up to max 50 GS, depending what the trader set as price
7-Lesser items like ores, vouchers and iridium are with a limited price, for example 10000 cr for a pack of 1/5/10 ores, vouchers*10=cr number and iridium*1000 or *10000=cr number, its there to deny any exploits.
8-GS items should go up to 50/100 per piece depending on value of the piece and NOT MORE.
9-Putting a credit price as well as GS price on the same item should be able.
10-Having a place to trade stuff you dont need for stuff you might need with overall controlled prices and limits that depend on people’s levels and numbers of trades (which is the same thing) should be doable and cannot negatively effect the overall SC economy, bundles will probably improve or still be bough by people that wont bother with trading, others will buy gs to trade, all in all a great idea, at least i think so… 
ORCA1911 roger&out! 