sentences:  This period of commercial growth created a significant urban middle class of white-collar bureaucrats and office workers, and allowed high-ranking PRI officials to graft large personal fortunes through their control over state-funded programs.State monopoly over key industries like electricity and telecommunication allowed a small clique of businessmen to dominate their sectors of the economy by supplying government-owned companies with goods and commodities.A major impact of Mexico's economic growth was urban population growth, transforming the country from a largely rural one to urban.