This new book tells the story of Mexico's dominant political party, the Partido Revoluconario Institucional (PRI), detailing its impact on the country's political system. Mexico's Ruling Party examines the party's role in maintaining political stability and stimulating economic growth and reviews the major problems which it now faces. It also reconstructs the historical evolution of the PRI and the so-called pendulum effect, elaborating on the internal structure of the party and its relationship with the political elite.