Though it seems unlikely, Tim Cook and Indira Jaising have something in common besides membership in Fortune’s 2018 ranking of the World’s Greatest Leaders. Cook (No. 14) is the wealthy CEO of Apple, the most valuable publicly traded company on earth; Jaising (No. 20) is an Indian lawyer who cofounded an NGO called Lawyers Collective, which promotes human rights issues. Yet they share this trait: Both have multiplied their organizations’ effectiveness by harnessing the power of unbundling. Following their example is a new imperative for the best leaders.