Critics of such reports have pointed out that they are often based on sketchy sources and are not always to be trusted at face value (see: Criticism of human rights reports on Khuzestan). Furthermore, critics point out that Arabs have social mobility in Iran, with a number of famous Iranians from the worlds of arts, sport, literature, and politics having Arab origins (see: Iranian Arabs) illustrating Arab-Iranian participation in Iranian economics, society, and politics. They contend that Khuzestan province, where most of Iran's Arabs live, is actually one of the more economically advanced provinces of Iran, more so than many of the Persian-populated provinces.