They need to have the ability to post persistent buy and sell orders, auction would be nice, but a running log of orders and transactions would go a long way toward having an economy. Even in a society as backwards as our 21st century one, we have the ability to look up previous/going prices for items and to place orders for goods not yet produced, at a certain price.
Someone want ideas for improving this game? (I am loving it so far)
Look toward the economy.
Make it easy for the casual crafter to buy/sell at good prices, as well as consumers not get "ripped off" because they only could find a price 100x the "going rate" in the GTN that day.