Well, I have no "best" but some, if you really want just one: The Science Of Government, Founded On Natural Law, by Clinton Roosevelt also available freely: https://dn790002.ca.archive.org/0/items/sciencegovernme00roo... it's strange at first, but if you accept the first pages in 15' you'll learn today economy at a whole.

If you are still hungry, Propaganda by Eduard Bernays would be the second.