Why do you say that it was not natural fertility and high levels of food production that were the causes of early urbanisation?

While natural fertility and food production may have contributed to early urbanization, other factors such as social organization, trade networks, and strategic location played equally important roles. Urbanization often occurred at sites where different cultures and resources could converge, leading to increased social complexity and specialization. Additionally, the concentration of power and wealth in cities facilitated the development of complex societies.