6. Empirical Approach and 35 6.1. 35 6.1.1. Source of 35 6.1.2. Description of variables 36 6.1.3. Probit 38 6.1.4. Empirical 38 6.2. Limitations of the 46 6.2.1. Problems of Survey Data Reliability in 47 7. Discussion and 49 7.1. Discussion of 49 7.2. Policy 51 55 69