Each seller has two types of goods; good A and good B. You and the other three sellers can set your price for good A, price for good B, and price for...

Each seller has two types of goods; good A and good B. You and the other three sellers can set your price for good A, price for good B, and price for the bundle that consists of goods A + B. Notice that the directions and the computer interface are colorcoded and make use of the fact that yellow and blue make green. You do not incur any cost to produce the goods you sell, and thus your profit equals the selling price if you make a sell. The other three sellers do not have any costs either. If I am selling, who is buying?