GOALPulisic, Dembele & Borussia Dortmund's money-making talent factoryTransfersBorussia DortmundBayern MunichBarcelonaPremier LeagueLaLigaManchester UnitedBundesligaManchester CityArsenalChelseaThorough research in the transfer market since 2012-13 has seen BVB continually pick up talented youngsters before selling them on for a tidy profit