Why is the youth unemployment rate above the average and so different across countries?

In a time of ever increasing educational attainment levels, young people still experience lower employment, income, and participation rates as well as higher unemployment compared to adults. The share of high school and tertiary graduates who accept jobs suited for lower education levels (skills mismatch) is high in many countries. The reason is the low level of work-related competences held by young people. Generating these competences should become a top priority for modern education systems. In addition, labor markets should be more flexible to allow earlier labor market entrance, though they should be wary of becoming over-reliant on the use of temporary contracts