Add a first list of Tier 1 variables

definitions/variable/macro-economy/consumption.yaml

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+- Consumption:
+    description: total consumption of all goods, by all consumers in a region
+    unit: billion USD_2010/yr
+    tier: 1
+    min: 0

definitions/variable/macro-economy/employment.yaml

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+- Employment:
+    description: Number of employed inhabitants (based on ILO classification)
+    unit: million
+    tier: 1
+    min: 0
+- Unemployment:
+    description: Number of unemployed inhabitants (based on ILO classification)
+    unit: million
+    tier: 1
+    min: 0

definitions/variable/macro-economy/gdp.yaml

@@ -1,6 +1,25 @@
 - GDP|MER:
     definition: GDP converted to USD at market exchange rate (MER)
     unit: billion USD_2010/yr
+    tier: 1
 - GDP|PPP:
     definition: GDP converted to USD using purchasing power parity (PPP)
     unit: billion USD_2010/yr
+    tier: 1
+- Value Added|{Economic Sectors}:
+    description: Value added by the {Economic Sectors}
+    unit: billion USD_2010/yr
+    tier: {Econ sectors}
+    navigate: Value Added|Commercial
+- Capital Formation:
+    description: net additions to the physical capital stock
+    unit: billion USD_2010/yr
+    tier: 1
+- Expenditure|Government:
+    description: total government expenditure
+    unit: billion USD_2010/yr
+    tier: 1
+- Expenditure|Household:
+    description: Total household expenditure
+    unit: billion USD_2010/yr
+    tier: 1

definitions/variable/macro-economy/macroeconomic_other.yaml

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+- Price|Carbon:
+    description: Price of carbon
+    unit: USD_2010/t CO2
+    tier: 1
+    drop_negative_weights: false
+    weight: Emissions|CO2
+- Revenue|Government:
+    description: Government revenue
+    unit: billion USD_2010/yr
+    tier: 1

definitions/variable/macro-economy/tag_econ_sectors.yaml

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+- Economic Sectors:
+    - Agriculture:
+        description: the aggregated agricultural sectors (ISIC Rev.4 A)
+        tier: 1
+    - Industry:
+        description: the aggregated industrial sector (ISIC Rev.4 B-F)
+        tier: 1
+    - Services:
+        description: the aggregated services sector (ISIC Rev.4 G-X)
+        tier: 1

definitions/variable/macro-economy/trade.yaml

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+- Export:
+    description: total exports measured in monetary quantities
+    unit: billion USD_2010/yr
+    tier: 1
+    min: 0
+- Import:
+    description: total imports measured in monetary quantities
+    unit: billion USD_2010/yr
+    tier: 1
+    min: 0

definitions/variable/population/population.yaml

@@ -1,18 +1,24 @@
 - Population:
     definition: Total population
     unit: million
+    tier: 1
 - Population|Urban:
     definition: Total population living in urban areas
     unit: million
+    tier: 2
 - Population|{Gender}:
     definition: Total {Gender} population
     unit: million
+    tier: 2
 - Population|{Gender}|{Age}:
     definition: Total {Gender} population {Age}
     unit: million
+    tier: 3
 - Population|{Gender}|{Age}|{Education}:
     definition: Total {Gender} population {Age} with {Education}
     unit: million
+    tier: 3
 - Mean Years of Education|{Gender}|{Age}:
     definition: Mean years of formal education of the {Gender} population {Age}
     unit: years
+    tier: 3