Engagement is derived from Engage. Recruit is a type of Engage. Recruit is a synonym of Enroll. 
Feed is related to Need. you would Shop because Need. Shop is related to Exchange. Exchange is related to Currency. 
Engagement --DerivedFrom--> Engage <--IsA-- Recruit <--Synonym--> Enroll 
Feed <--RelatedTo--> Need <--MotivatedByGoal-- Shop <--RelatedTo--> Exchange <--RelatedTo--> Currency 