These costs depend, among other factors, on the availability of suitable applicants on the external labour market. With fewer qualified workers on the external labour market, the number of job applicants will be smaller and the matches will be worse on average (Mohrenweiser and Backes-Gellner, 2006). According to an employer survey, 85% of companies in Austria considered that the recruitment of trained workers who are not available on the labour market was one main reason for offering apprenticeships (Lassnigg and Steiner, 1997). For this company the pool of suitable job applicants will include former apprentices trained in landscape gardening, either within the company or in another company.