Because they, to pursue their own self interests, have to satisfy a certain need of a certain population (market segmentation). To do this, they must obtain the necessary factors of production, as technology, land, capital and workers.
But they don’t get those (in a free-market setting) by coercive means (like the State), they have to cooperate with the other agents of the economy, emerging the concepts of division of labor and voluntary exchange.
Because they, to pursue their own self interests, have to satisfy a certain need of a certain population (market segmentation). To do this, they must obtain the necessary factors of production, as technology, land, capital and workers.
But they don’t get those (in a free-market setting) by coercive means (like the State), they have to cooperate with the other agents of the economy, emerging the concepts of division of labor and voluntary exchange.