What was a direct cause of job specialisation in early human civilizations?

A direct cause of job specialization in early human civilizations was the advent of agriculture, which enabled communities to produce surplus food. This surplus allowed individuals to focus on specific tasks beyond food production, such as toolsmithing, pottery, and trade. As populations grew and societies became more complex, the division of labor became essential for efficiency and innovation, leading to the emergence of distinct professions and crafts. This specialization ultimately contributed to the development of more advanced social structures and economies.