Each player rolls a die, but may bid Trade Goods from the general supply to increase his roll by 2 per TG. Bids are placed simultaneously before rolling the dice. Players receive Bonus Trade Goods according to the following formula:
My Bonus Trade Goods = Trade Goods bid by the first Speaker minus my own bid
You receive at least 0 TGs.
For example, if the winning roll bid 2 Trade Goods, you rolled miserably with a bid of 4, and I did not bid anything for my roll, winning roll gets nothing, you get nothing (2-4=-2 ... meaning 0), I get 2 Trade Goods.