Agency is related to Central. Central is related to Market. Market is a synonym of Marketplace. 
you are likely to find Fish in/at/on River. Fish is related to Liver. Liver is related to Process. Decrease is a type of Process. 
Agency <--RelatedTo--> Central <--RelatedTo--> Market <--Synonym--> Marketplace 
River <--AtLocation-- Fish <--RelatedTo--> Liver <--RelatedTo--> Process <--IsA-- Decrease 