Social capital (SC) affects quality of life, sport behaviours and health in individual and community context. The aim was to analyse how sports activity (SA) contributes to SC accumulation in a post-transformation country. A combination of four longitudinal, nationwide datasets was used. Instrumental variable method was applied. Results show that in 19+ Poles, on a regional level, SA improves SC. This suggest that sports clubs and at least some types of sports infrastructure can constitute a valid tool for social policies aiming at improving social involvement. The self-triggering character of SA is a valuable asset for social impact regionally and beyond. It is important to estimate the changes in a long-term perspective, due to the inertness of the SC.

Background. The aim of this study was to assess how retirement affects the short-term (up to 2 years after retirement) and medium-term (2-4 years) sport/exercise activity (S/EA) of Poles. To gain a broader context for interpretation, the effect of retirement on self-rated health status, attitudes, social activity, and sexual life was analysed. Methods. A quasiexperiment utilizing data from the longitudinal study Social Diagnosis and radius-matching method was conducted. Retiring men and women were matched with similar, nonretiring ones to make comparisons of differences in S/EA and other outcomes interpretable in terms of causality. Results. Retirement does not have a significant effect in the short term on S/EA of men (p=.440) and women (p=.340). The satisfaction of men with their health status in this period was improved (p=.007), although they more often declared health problems that impaired their everyday functioning (p=.045). Women rarely reported serious health problems (p=.024). In the medium perspective, retirement had the effect on reducing S/EA in men (p=.012) and various dimensions of their social life. Although men tend to worry more often about their health (p<0.001), they are less likely to suffer from problems with moving (p=.001) and fatigue (p=.013). Despite the fact that women are more often satisfied with their health (p=.027), they also more often complain about heart or chest pain (p=.010), body pain (p=.009), and fatigue (p=.007). Conclusion. It is necessary to prepare employees for retirement much earlier than in the preretirement age. In addition to raising awareness of the effect of S/EA functions, it is necessary to monitor the physical activity of employees and to use appropriate programmes for (1) maintaining motivation among employees who are physically active before they retire and (2) raising awareness and encouraging physical activity in employees who are physically passive.

Using clustering and principal component analysis, we demonstrate that—at the national level in Europe—innovativeness correlates strongly to both social capital and participation in sport. In this aspect, countries such as the Scandinavian countries and the countries of Central and Eastern Europe differ visibly. Referring to prior empirical research, we claim that a causal relation between sports, through social capital, and innovativeness can be established. In the context of social capital accumulation, we further discuss the role of sports clubs, often perceived as a socially intensive form of participation in sport, but most likely diminishing in this respect lately.

We employ a duopoly model with horizontal differentiation of a product to analyse impact of imperfect patent rights in the form of a patent thicket on market entry and outcomes in a market when a single unit of a good is to be provided, reflecting a competition of two potential suppliers within a tender procedure of a complex product. We show that even under price competition, a treat of litigation coming from the overlap in the patent protection leads to pricing decisions above marginal costs level. Such a situation, on the one hand, is socially costly due to costs linked to fixed costs of market entry of both competitors, but on the other hand, it is not necessarily the most beneficial from the point of view of a buyer. The paper resolves Bertrand paradox in a novel way.