The terraforming has produced dangerous conditions, so the cave entrance is closed for now. If the factory for this system has been built, the owner must remove it and make the deed available for purchase again. The owner receives half the value of the factory in compensation. The colonists receive a plus one since their species occupies the city. If the colonists win the roll, they take the most expensive good the player has.
Desperate colonists attempt to cheat the merchant.
As poor as they are, sometimes an IOU is the best form of payment. The item bought this turn may be purchased at half price. The colonists attempt to attract trade by lowering prices. The item sold this turn will be at one and a half it's price. Increased demand for essential goods results in higher prices.