Fig.1 Hierarchical Tree of Commodities Covered by Trade Matrix  
 
 
MAIN RESOURCES
  BIOMASS   FOOD BIOMASS   MEAT AND PREPARATIONS  
  BovinePigPoultryMuttonOthers      
     
  FISH AND PREPARATIONS  
  FishShell Fish  
     
  CEREALS AND PREPARATIONS  
  WheatMaizeBarleyRiceOthers    
  WOOD BIOMASS  
  PulpwoodOther WoodWood ShapedPulp  
   Wood ManufacturesPaper Paperboard and Manufactures  
 
 
  BASE METAL   IRON  
  Iron oreIron and SteelIron Scrap    
 
  OTHER BASE METAL   ALUMINIUM  
  Aluminium oreAluminaAluminium    
     
      BASE METAL ORE    
  ,EXCLUDING FERROUS ALUMINIUM    
  Copper oreNickel oreLead ore      
   Zinc oreOther Base Metal ore      
     
  BASE METAL    
  ,EXCLUDING FERROUS ALUMINIUM    
  CopperNickelLeadZinc    
     Other Base Metal  
       
  FOSSIL FUEL        
  PetroleumCoalGas