"interaction with real economy" . "real money transactions" . "money or treasure" . "game economy" . . . "in-game economy" . "virtual currency" . "economy interaction" . "in-game currency" . "economy" . "business model" . "in-game currencies" . . "Virtual money" . "Virtual property" . "economic models" . "RMT" . . "VE" . . "real-world trading" . "Virtual_economy#Black_market" . "virtual gold" . "gold" . . "in-app purchases" . "Virtual economy#Controversy" . "real-world currency" . . "player driven economy" . "currency" . "trading" . . "virtual economy" . "virtual money" . "Virtual economy" . . "premium currency" . "virtual property" . "in-game purchases" . . "currencies" . "real-money-trading" . . "Virtual currency" . . "virtual microcurrency" . "virtual economies" . . "premium character" . "real money trading (RMT)" . "virtual currencies" . "real-money trading" . "virtual assets" . . "site currencies" . "brokers items obtained from video games" . "VC" . "Virtual economy" .