The collectors collect about 90% of everything that is recycled in Brazil. Self-employed workers are the basis of the pyramid of an unregulated and unrecognized sector.
They survive by selling what they collect. Plastic and cardboard, for example, are worth about R$0.20/Kg (USD 0.04/Kg), and the glass about R$0.05/Kg (1c USD/Kg).
— Origem: coleção infinita de links do @efeefe