The relationship between employment and education was less marked for women, who were more likely to be classified as economically inactive. Investment in education also helps the individual to enter internal labour markets (see Section 13.5). In addition, Table 13.7 shows that there is a premium to education – the higher the level of educational achievement, the higher the average salary. Evidence shows that this additional earning power only applies to traditional academic qualifications and not to vocational qualifications. In the UK, for example, an advanced GNVQ is supposed to be equivalent to two A levels but in earning power only appears to be worth as much as five good grade GCSEs.