API reference

TransportNetworkWelfare.initialize_project — Function

Create a runnable generic CSV/TOML project from a bundled model template.

TransportNetworkWelfare.load_project — Function

Load and type-check a schema-versioned project configuration.

TransportNetworkWelfare.validate — Function

Validate input schemas, accounting identities, route contraction, and model regularity.

TransportNetworkWelfare.build_model — Function

Load project data and build the common route-modal-congestion closure system.

TransportNetworkWelfare.welfare_effects — Function

Compute directed-arc and physical-link welfare effects under the full closure.

TransportNetworkWelfare.decompose_welfare — Function

Compute the exact closure ladder and analytical welfare decomposition.

TransportNetworkWelfare.sensitivity_path — Function

Trace the mean local welfare effect while changing one declared parameter.

TransportNetworkWelfare.load_policy_bundles — Function

Load a sparse set of coordinated primitive-cost shocks from CSV.

TransportNetworkWelfare.bundle_welfare_effects — Function

Aggregate directed welfare derivatives into declared coordinated policy bundles.

TransportNetworkWelfare.write_results — Function

Write result CSVs, diagnostics, and an optional run manifest.

TransportNetworkWelfare.EconomicGeography — Type

Economic-geography model with mobile labor and trade in differentiated goods.

TransportNetworkWelfare.UrbanCommuting — Type

Allen-Arkolakis urban model with separate residence and workplace choices.

TransportNetworkWelfare.ChoiceLogsum — Type

Economically standard negative-power mode-choice logsum.

TransportNetworkWelfare.ComponentCES — Type

Legacy positive-power component index used by the audited July 2026 RSUE package.

TransportNetworkWelfare.urban_finite_difference — Function

Nonlinear central finite-difference check using the independent one-mode oracle.

TransportNetworkWelfare.urban_multimodal_finite_difference — Function

Independent nonlinear central finite difference for one urban policy edge-mode.

A primitive shock enters the modal cost fixed point. A realized shock instead holds fixed the induced aggregate edge-cost change. This compensated perturbation is the nonlinear counterpart of the realized-cost forcing B*Sagg*e_p; congestion still responds to the urban state, but does not alter the imposed realized shock.