With the growth of the Colombian drug cartels in the 1980s, coca leaf became a valuable agricultural commodity, particularly in Peru and Bolivia, where the quality of coca is higher than in Colombia. To supply the foreign markets, the cartels expanded the cultivation to areas where coca was not a traditional crop. Many poor campesinos, driven from the central highlands by lack of land or loss of jobs, migrated to the lowlands and valleys of the eastern Andes, where they turned to the cultivation of coca.