China could not afford a heavy investment, either ideologically or financially, in the education of a few students. Since 1978 China's leaders have modified the policy of concentrating education resources at the university level, which, although designed to facilitate modernization, conflicted directly with the party's principles. The policies that produced an educated elite also siphoned off resources that might have been used to accomplish the compulsory nine-year education more speedily and to equalize educational opportunities in the city and the countryside. The policy of key schools has been modified over the years. Nevertheless, China's leaders believe an educated elite is necessary to reach modernization goals. Corruption has been increasingly problematic for rural schools. Because the educational funding is distributed from the top down, each layer of bureaucracy has tended to siphon off more than its share of funding, leaving too little for the bottom rural level.