Why did Plato argued that people should be divided into three basic groups?

Plato believed in a hierarchical society where individuals are assigned roles based on their inherent abilities and aptitudes. By dividing people into three groups (rulers, auxiliaries, and producers), he aimed to ensure a harmonious and stable society where each group contributes to the common good based on their strengths. Plato argued that this division would lead to a just and efficient society where individuals fulfill their roles effectively.