This theory that insists that each of us is born without a personality and we acquire our personality as a result of social experiences is known as

Social learning theory is the theory that insists that each of us is born without a personality and we acquire our personality as a result of social experiences. We learn our behaviors and patterns through interactions that we make and from the immediate environment that we find ourselves in. We develop this through learning and through experience.

Sector is best defined as (part).