Random triples
| Subject | Object |
|---|---|
| gptkb:Yu-Gi-Oh!_Duel_Monsters:_Eternal_Duelist_Soul | Card trading system |
| gptkb:Galaxy_on_Fire_2:_Supernova | buying and selling |
| gptkb:Topps_Bunt | peer-to-peer trading |
| gptkb:Sunless_Sea | gptkb:complex |
| gptkb:Zynga's_Farm_Ville:_Tropic_Escape | trading mechanics |
| gptkb:Topps_Bunt | gptkb:market |
| gptkb:Elite:_Frontier | market fluctuations |