Apprenticeship is an active labour market policy that favours transition from school to work and matching labour demand and supply of youth. Its effectiveness differs from context to context, because it requires the activation and motivation of stakeholders. Apprenticeship is a personnel contract and a social contract. Apprenticeship has no consequence, if it is based only on economic incentives. The existential logic according to D. Hume, along with the capability approach, allow us to understand how it is possible to "activate" such a policy to make it effective