Read: Poor citizens have little influence over politicians. In some countries, citizens have only a weak hold on politicians. Even with free and fair elections, the poor may not be able to push politicians to deliver services: they may not know how good those services are (and politicians know this); they may vote by ethnicity or caste, caring less about public services; or they may not believe candidates' promises of better services, perhaps because terms in office are too short to deliver. Which is the most logical next sentence?