91Bxx Mathematical economics

• 91B06 Decision theory
  
• 91B24 Price theory and market structure
  
• 91B26 Market models (auctions, bargaining, bidding, selling, etc.)
  
• 91B28 Finance, portfolios, investment
  
• 91B32 Resource and cost allocation
  
• 91B76 Environmental economics (natural resource models, harvesting, pollution, etc.)