Motive is related to Crime. Crime is related to Detective. 
you would Buy because Own. Buy is related to Purchase. Purchase is related to Product. Product is related to Processing. 
Motive <--RelatedTo--> Crime <--RelatedTo--> Detective 
Own <--MotivatedByGoal-- Buy <--RelatedTo--> Purchase <--RelatedTo--> Product <--RelatedTo--> Processing 