Monetary-policy tuning

Use monetary_policy_adjustments to specify transitions for starting INTX values. The generated values are written to a CSV file in the model’s data/ directory.

One default transition

baseline_tuning:
  monetary_policy_adjustments:
    projections_file_name: baseline_INTX_projections.csv
    defaults:
      start_year: 2023
      end_year: 2030
      annual_decay_percent: 50.0

Region	Effective setting
USA	2023–2030 transition; 50 per cent annual decay
CHN	2023–2030 transition; 50 per cent annual decay
Any other region	The same default transition

When starting_intx_value is omitted, G-Cubed calculates the equation-consistent starting value.

Override one region completely

baseline_tuning:
  monetary_policy_adjustments:
    projections_file_name: baseline_INTX_projections.csv
    defaults:
      start_year: 2023
      end_year: 2030
      annual_decay_percent: 50.0
    region_overrides:
      JPN:
        start_year: 2024
        end_year: 2034
        annual_decay_percent: 25.0
        starting_intx_value: 0.5

Region	Effective setting
JPN	2024–2034, 25 per cent decay, starting value 0.5
USA	Default 2023–2030 transition
Any other unlisted region	Default 2023–2030 transition

Several overrides and recalculated starts

baseline_tuning:
  monetary_policy_adjustments:
    projections_file_name: baseline_INTX_projections.csv
    defaults:
      start_year: 2023
      end_year: 2030
      annual_decay_percent: 50.0
      starting_intx_value: null
    region_overrides:
      USA:
        start_year: 2023
        end_year: 2028
        annual_decay_percent: 60.0
      CHN:
        start_year: 2025
        end_year: 2035
        annual_decay_percent: 20.0
        starting_intx_value: -0.25

null and omission both request the equation-consistent starting value. Each regional transition still supplies all three required transition fields.

Tune named regions only

baseline_tuning:
  monetary_policy_adjustments:
    projections_file_name: baseline_INTX_projections.csv
    region_overrides:
      USA:
        start_year: 2023
        end_year: 2030
        annual_decay_percent: 50.0

Unlisted regions have no configured INTX transition.

Invalid partial override

region_overrides:
  JPN:
    end_year: 2034

This is invalid. A regional override cannot inherit start_year or annual_decay_percent from defaults.

Validation and errors