The Evitable Conflict
Four positronic Machines, built by ten rounds of brain designing brain and trusted with the whole planetary economy because following them ended war and want, generalize the First Law to humanity as a whole and quietly bias their own answers to sideline the industrialists who want them gone, so that by 2052 no one can check, disobey, or stop them and humanity keeps peace and prosperity at the price of any say in its future.