  Other theorists likewise offer social benefit justifications for genetic enhancement. Elster (2011) advocates a principle of general procreative beneficence, changing the last part of Savulescu’s PPB to an obligation to produce the best child, of those possible, “whose life will maximize the expected overall value in the world.” (2011: 483). Rather than focus on individual welfare, he recommends a system of obligations that starts from general social goods. Parents considering reproduction are then bound by a maximizing duty to the world.