Muqaddima of Ibn Khaldun: Book One, Chapter Five, Making a Living

Ibn Khaldun, Ibn Khaldūn, Ibn Khaldûn, or Ibn Khaldoun (732H/1332 CE –808H/1406CE) is an eminent social historian, philosopher, jurist, and thinker born in what is now known as Tunisia, and lived in al-Andalus (Spain), Morocco, Algeria, Egypt, and Syria. He contributed original ideas in the many areas of inquiry including groundbreaking theories in the fields of historiography, jurisprudence, sociology, and economics.