After the end of the turn, traders from every nation convene at the world trade market. Before trading begins, all the possible deals are compared and placed in order.
Each offering country ranks the bidders in an order which is determined by the price the bidder would pay, and the strength of the diplomatic relations between potential buyer and seller. You can offer to pay extra (above the world price) using the diplomacy screen.
Then the real trading begins, as the trade round for each commodity is conducted. Trade deals are presented one at a time in order to each potential buyer. Items from an offering nation are offered to their first place bidder, followed (if any remain unsold) by an offer to their second place bidder, and so on.
Traders present offer sheets to you and you will accept or reject the offered commodities. You will receive an additional Briefing at that time.
