91Bxx Mathematical economics (For econometrics, see 62P20)
- 91B02 Fundamental topics (basic mathematics, methodology; applicable to economics in general)
- 91B06 Decision theory [See also 62Cxx, 90B50, 91A35]
- 91B08 Individual preferences
- 91B10 Group preferences
- 91B12 Voting theory
- 91B14 Social choice
- 91B15 Welfare economics
- 91B16 Utility theory
- 91B18 Public goods
- 91B24 Price theory and market structure
- 91B25 Asset pricing models
- 91B26 Market models (auctions, bargaining, bidding, selling, etc.)
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91B30 Risk theory, insurance
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- 91B32 Resource and cost allocation
- 91B38 Production theory, theory of the firm
- 91B40 Labor market, contracts
- 91B42 Consumer behavior, demand theory
- 91B44 Informational economics
- 91B50 General equilibrium theory
- 91B51 Dynamic stochastic general equilibrium theory
- 91B52 Special types of equilibria
- 91B54 Special types of economies
- 91B55 Economic dynamics
- 91B60 Trade models
- 91B62 Growth models
- 91B64 Macro-economic models (monetary models, models of taxation)
- 91B66 Multisectoral models
- 91B68 Matching models
- 91B69 Heterogeneous agent models
- 91B70 Stochastic models
- 91B72 Spatial models
- 91B74 Models of real-world systems
- 91B76 Environmental economics (natural resource models, harvesting, pollution, etc.)
- 91B80 Applications of statistical and quantum mechanics to economics (econophysics)
- 91B82 Statistical methods; economic indices and measures
- 91B84 Economic time series analysis [See also 62M10]
- 91B99 None of the above, but in this section