Corruption often spreads because of ignorance and lack of adequate knowledge about the subject as well as how to correct and contain it. On the other side, corrupt legal, political, bureaucratic, and other social system(s) help corruption swell further. The current article sets out to discuss the question: Is there is a relation between perceived grand corruption and petty corruption? In Iran, too, these two types of corruption have recently become debatable issues. And as in Iran, corruption has become the most challenging issue in many developing countries. With respect to the above relationship, while the theoretical literature makes ambiguous predictions, empiricists, too, have focused little on this subject. The present article tries to examine this issue systematically and, hence, suggests that the perceived grand corruption is significantly associated with the petty corruption. Similar results persist even when grand corruption originates in a country's legal system. In a nutshell, the article identifies a positive correlation between perceived grand corruption and petty corruption.