A Computable General Equilibrium (CGE) model is a quantitative economic model that represents an economy as interconnected markets for goods and services, factors of production, institutions, and the rest of the world. It is calibrated with data (typically a Social Accounting Matrix) and solved numerically as a system of nonlinear equations until equilibrium conditions (zero-profit, market-clearing, and income-balance) hold within tolerance.

JCGE is a block-based CGE modeling and execution framework in Julia. It defines a shared RunSpec structure and reusable blocks so models can be assembled, validated, solved, and compared consistently across packages.

Placeholder for a converter that lowers MPSGE.jl model objects into JCGE blocks.

Scope:

• Import MPSGE.jl model objects (not the MPSGE language as a first-class input).
• Act as a converter + conformance test harness for block-based models.

Input:

• An MPSGEModel object (constructed via MPSGE.jl macros).
• Optional calibration data for complex models (e.g., trade and tax blocks).

Translation:

• sectors/commodities/consumers → corresponding block entities
• each @production tree → production block (nest structure + elasticities + quantities)
• each @demand → household/institution block (final demands + endowments + transfers)
• taxes/margins (if present) → tax blocks / wedges routed to agents
• numeraire/fixed variables → RunSpec closures/fixes/normalization fields

Output:

• RunSpec (what to solve, closures, shocks/scenarios)
• generated block model instance (the “what” to solve)

using MPSGE
using JCGEImportMPSGE

m = MPSGEModel()
# ... define sectors/commodities/consumers/production/demand with MPSGE.jl macros ...

spec = import_mpsge(m; name="MyMPSGE")

• Scalar sectors, commodities, and consumers
• Fixed-coefficient (Leontief) production from @production netputs
• Cobb-Douglas demand from @final_demand
• Endowments from @endowment
• Commodity market clearing with MCP complementarity (MCP-only import)
• Optional data-assisted import to populate full block sets for complex models

Unsupported MPSGE features (for now):

• Nested production trees (beyond flat netputs)
• Non-Cobb-Douglas demand
• Taxes, margins, and auxiliary constraints
• Multi-region indexing

import_mpsge always produces an MCP formulation (no objective). Use PATH via PATHSolver.Optimizer to solve the imported model.

If you use the JCGE framework, please cite:

Boero, R. JCGE - Julia Computable General Equilibrium Framework [software], 2026. DOI: 10.5281/zenodo.18282436 URL: https://JCGE.org

@software{boero_jcge_2026,
  title  = {JCGE - Julia Computable General Equilibrium Framework},
  author = {Boero, Riccardo},
  year   = {2026},
  doi    = {10.5281/zenodo.18282436},
  url    = {https://JCGE.org}
}

If you use this package, please cite:

Boero, R. JCGEImportMPSGE.jl - Importer from MPSGE.jl model objects into JCGE. [software], 2026. DOI: 10.5281/zenodo.18335430 URL: https://ImportMPSGE.JCGE.org/ SourceCode: https://github.com/equicirco/JCGEImportMPSGE.jl

@software{boero_jcgeimportmpsge_2026,
  title  = {JCGEImportMPSGE.jl - Importer from MPSGE.jl model objects into JCGE.},
  author = {Boero, Riccardo},
  year   = {2026},
  doi    = {10.5281/zenodo.18335430},
  url    = {https://ImportMPSGE.JCGE.org/}
}

If you use a specific tagged release, please cite the version DOI assigned on Zenodo for that release (preferred for exact reproducibility).