Estudio (5) Colombie (2) Evolution (Biology) (2) Unemployment (2) Materials (2) Markets (2) Happiness (2) Felicidad (2) Paro (2) Mercados (2) Evolución (2) Materiales (2) Santander (1) Gross domestic product (1) Labor (1) Minerals (1) Labor market (1) Exports (1) Unemployed (1) Twenty-first century (1) Tobacco (1) Time (1) Sampling (1) Respiratory organs--Diseases (1) Research (1) Quality of products (1) Prices (1) Price indexes (1) Poverty (1) Pollutants (1)