What was the primary reason that a fourth sector of the economy was created?

The primary reason that a Fourth sector of the economy was created is to move forward societal benefit and for-profits, they make a considerable part of their income from business activities.

The fourth sector’s growth will bring expansion in market and new customers, business and investment opportunities. It will increase productivity and strengthen supply chains. It will also make room for industries whose goods are public goods like health care, banking, education, utilities and so on.

probably 3 since archeologists and historians don’t understand there writing.