Economics is etymologically related to Economy. Economy is related to Budget. Budget is a type of Calculate. 
Body is related to Disease. Disease is related to Condition. Situation is a type of Condition. Unemployment is a type of Situation. 
Economics --EtymologicallyRelatedTo--> Economy <--RelatedTo--> Budget --IsA--> Calculate 
Body <--RelatedTo--> Disease <--RelatedTo--> Condition <--IsA-- Situation <--IsA-- Unemployment 