As trade intensified between Africa and Asia, prosperous city-states flourished along the eastern coast of Africa.
Social system of rights and duties based on land tenure and personal relationships
Wants and needs is predominantly caused by brains in order to fulfill what our body considered missing. In order to fulfill this, our brain tend to give signals that make us focus to make that fulfillment before we could move on to others.
Because of this, our perceptions tend to be catered in order to finish this fulfillment. (for example, starving people may create a perception where they see anoher objects as an actual food)
Explanation:
match each term whit its meaning input, suplies and demand
