Temporary constant shocks

temporary_constant applies one value from start_year through end_year, including both boundary years, and zero elsewhere.

A one-year shock

layers:
  - id: one_year_target
    name: One-year inflation-target increase
    data_file_name: one_year_target.csv
    event_year: 2026
    description: Increase the USA inflation target for one year
    shocks:
      - variable_prefix: INFX
        selectors:
          - dimension: regions
            members: [USA]
        value_path:
          type: temporary_constant
          start_year: 2026
          end_year: 2026
          value: 1.0
          units: percentage points

Year	2026	2027	2028	2029
Value	1.0	0	0	0

A three-year shock

value_path:
  type: temporary_constant
  start_year: 2027
  end_year: 2029
  value: 2.0
  units: per cent of GDP

Year	2026	2027	2028	2029	2030
Value	0	2.0	2.0	2.0	0

A temporary reduction in several regions

value_path:
  type: temporary_constant
  start_year: 2026
  end_year: 2028
  value: -0.5
  units: percentage points

Year	2026	2027	2028	2029
Value	-0.5	-0.5	-0.5	0

This path can sit below a selector with members: [USA, CHN] to generate the same projection for both regions.

end_year earlier than start_year, or either year outside the layer period, is invalid.

Explicit shocks