One of Borissov's predecessors, Tsvjatko Tsetkov, says two factors caused the market to shrink: the conflict in Afghanistan has led to a drop in drug production there, and customs control has been strengthened along Bulgaria's border.
Jedan od Borisovljevih prethodnika, Cvjatko Cenkov, kaže da su na sužavanje tržišta uticala dva faktora: sukob u Avganistanu doveo je do smanjenja proizvodnje droge u toj zemlji, a carinska kontrola duž bugarske granice je pooštrena.