Geographical location and topic(s) of studies
| Geographical location | Number of studies | Reported industry aim(s) | ||
| Influence tax levels | Influence tax levels and structures | Influence tax structures | ||
| African countries | 1 (national: South Africa)13 | 113 | 0 | 0 |
| European countries | 1 (national: Hungary)14 | 0 | 114 | 0 |
| Former Soviet Union countries | 3 (2 national: Moldova and Uzbekistan; 1 regional)15 57 58 | 0 | 115 | 257 58 |
| Middle Eastern countries | 2 (1 national: Lebanon; 1 regional)16 17 | 0 | 216 17 | 0 |
| North American countries | 29 (7 national: 6 USA, 1 Canada; 21 state level in USA, 1 province level in Canada)18–56 | 2818–22 24–56 | 123 | 0 |
| Total | 36 | 29 | 5 | 2 |