Polyhedral Combinatorics in Combinatorial Optimization

Polyhedral combinatorics is a subarea of combinatorial optimization of increasing practical importance. It deals with the application of the theory of linear systems and linear algebra to combinatorial problems. The paper is not intended as a survey on polyhedral combinatorics but it reviews some of the main concepts and proof techniques.     

‘Employability-miles’ and worker employability awareness

This article studies the use and impact of a (‘Employability-miles’) voucher scheme. These vouchers could be used for participation in a restricted number of training courses, which all aim to stimulate employees to develop a more active attitude towards their own employability. Using data from two surveys of one firm’s workforce, we find that voucher use is related to various personality traits and personal characteristics. In particular, a worker’s ambition, goal setting and education level are positively related to voucher use. In addition, workers with longer tenure spend their vouchers more often. Conversely, workers with a more positive self-image as well as those who are negatively reciprocal spend their vouchers less often. The negative relation between voucher use and negative reciprocity suggests that workers who are more negatively reciprocal perceive the voucher as an HR tool for outplacement. Further, we find that voucher use positively affects worker employability awareness and willingness to train. Remarkably, participation in non voucher training shows little relation to personality traits. From a human resources (HR) perspective, this finding suggests that by employing a voucher scheme, the firm makes training participation more dependent on employee personality and individual characteristics instead of the HR development strategy of the firm.     

Active Labour Market Policy by a Profit‐Maximizing Firm

This article investigates the effectiveness of an employment programme exclusively run by a private sector firm in order to find out whether such a programme can be beneficial to both the participating individuals and the private firm. To answer these questions, we use a unique dataset on a private employment programme covering 23 years of operations and data on 1,000 participating unemployed individuals. Using conservative estimates, we show that a private employment programme is more effective in reintegrating the unemployed than public efforts, while providing tangible benefits to the firm.