Contribute is a synonym of Gift. Gift is related to Exchange. Change is etymologically related to Exchange. Mix is a type of Change. 
Spending is related to Money. Money is related to Wealth. Gold is a type of Wealth. Gold is related to Olympic. 
Contribute <--Synonym--> Gift <--RelatedTo--> Exchange <--EtymologicallyRelatedTo-- Change <--IsA-- Mix 
Spending <--RelatedTo--> Money <--RelatedTo--> Wealth <--IsA-- Gold <--RelatedTo--> Olympic 