Jane Jacobs / Systems of Survival A Dialogue on the Moral Foundations of Commerce and Politics chapter three

Armbruster's  group has been unable to identify behaviour systems other than the two presented by Kate. In Chapter Two they get a little help from Plato. In The Republic says Jacobs, or rather her speaker Armbruster, Plato "or rather, his speaker Socrates... takes pains to distinguish between two great, major groups of occupations and their purposes, precisely to disentangle their contradictory virtues from one another... He said both are necessary... the commercial occupations to supply everybody's physical needs and also support the guardians, presumably by taxation.

"The guardians are the Moral Syndrome B people... Police, soldiers, government policy makers and rulers... They're necessary to protect the state from corruption within and enemies outside... I propose you call Syndrome A 'commercial' and Syndrome B 'guardian'."

The chapter continues with the group  discussing in more detail the Commerce Syndrome and it's precepts, their purposes and origins and instances where this system contradicts, or seems to contradict the values listed in the Guardian Syndrome.