Add first query to conceptualization

concepts.md

@@ -289,6 +289,181 @@ main policy areas identified [@ilo2022]:
 - reach those not adequately protected
 - ensure access for everyone to comprehensive, adequate, sustainable social protection over life cycle
 
+# Term clusters
+
+## World-of-work cluster
+
+- work
+- [x] production of goods, provision of services
+- [x] use by others or own-use
+- regardless of legality
+
+- labour
+- [x] production of goods, provision of services, 
+- [x] use by others
+- of working age
+- [x] for pay or profit (remuneration, wages, salaries for time worked work done, profits derived from goods or services, through market transactions)
+
+## forms of work cluster
+
+- [x] own-use
+- [x] employment
+- [x] unpaid trainee
+- [x] volunteer
+- other work activities
+
+- [x] domestic
+- [x] wage-employed
+- [x] self-employed
+- [x] formality
+- [x] (unpaid) care work
+
+## inequality cluster
+- [x] inequality/-ies
+- [x] barrier(s)
+- [x] (dis)advantaged
+- [x] discriminated
+- disparity/-ies
+- horizontal / vertical inequality
+## vertical inequalities cluster
+
+- [x] income:
+    - Palma ratio
+    - Gini coefficient
+
+## horizontal inequalities cluster
+
+- [x] visible identity 
+- [x] gender, colour or beliefs
+- [x] racial, ethnic inequalities
+- [x] migrants and nationals
+- [x] spatial inequalities (rural/urban/large mega-cities/small/peripheral cities)
+- [x] gender, age, nationality, ethnicity, health status, disability, characteristics
+
+## outcome cluster
+
+- [x] employment outcomes
+- [x] labour rights
+- [x] opportunities between groups
+- [x] equality of opportunity/outcome
+
+## policy cluster
+
+- [x] intervention
+- [x] policy
+- [x] participation
+- [x] targeting/targeted
+
+## Query
+
+```sql
+TS=
+(
+    (
+        work OR
+        labor
+    ) AND 
+    (
+        production of goods OR
+        provision of services OR
+        use by others OR 
+        own-use OR
+        for pay OR
+        for profit OR
+        remunerated OR
+        for wages OR
+        waged OR
+        for salaries OR
+        salaried OR
+        for time worked OR
+        for work done OR
+        profits derived OR
+        through market transactions
+    )
+) AND
+
+TS=
+(
+    employment OR 
+    unpaid trainee OR
+    volunteer OR
+    domestic work OR
+    wage-employed OR
+    self-employed OR
+    formal employment OR
+    informal employment OR
+    unpaid care work OR
+    care work
+) AND
+
+TS=
+(
+    inequality OR
+    inequalities OR
+    barriers OR
+    advantaged OR
+    disadvantaged OR
+    discriminated OR
+    disparity OR
+    disparities
+) AND
+
+TS=
+(
+    income OR
+    identity OR
+    gender OR
+    beliefs OR
+    color OR
+    racial OR
+    ethnic OR
+    ethnicity OR
+    migrant OR
+    nationality OR
+    spatial AND
+    (
+        rural OR
+        urban OR
+        mega-city OR
+        large city OR
+        small city OR
+        peripheral city
+    ) OR
+    age AND
+    (
+        young OR
+        youth OR
+        old OR
+        senior
+    ) OR
+    disability OR
+    health status OR
+    education OR
+    educational access OR
+    social mobility
+) AND
+
+TS=(
+    employment outcome OR
+    labor rights OR
+    opportunities between groups OR
+    equality of opportunity OR
+    equality of outcome OR
+    labour market outcome OR 
+    income OR
+    job quality
+) AND
+
+TS=(
+    intervention OR
+    policy OR
+    policies OR
+    participation OR
+    targeting OR
+    targeted
+)
+```
+
 \pagebreak
 
 # Relevant references