Long-Run Performance Persistence of Investment Funds

This article analyzes the long-run persistence of returns and risk of investment in the assets of money, bound, and stock funds recorded on the Polish market in 2000–12. Portfolios of safe, hybrid, and stock classes are formed on the basis of tested funds. The persistence of returns and the Sharpe ratio are investigated in rolled five-year sub-periods, with one year step. Also, persistence in performance is assessed using classic CAPM and Fama and French models, which allow for evaluating management skills. We find the occurrence of the Sharpe ratio long-run persistence of money and bound funds. The study does not explicitly show long-run persistence in hybrid and stock fund portfolios. The CAPM and Fama and French models simulations of returns on stock and hybrid funds indicate varying management skills during five-year periods.     

Applying free random variables to random matrix analysis of financial data. Part I: The Gaussian case

We apply the concept of free random variables to doubly correlated (Gaussian) Wishart random matrix models, appearing, for example, in a multivariate analysis of financial time series, and displaying both inter-asset cross-covariances and temporal auto-covariances. We give a comprehensive introduction to the rich financial reality behind such models. We explain in an elementary way the main techniques of free random variables calculus, with a view to promoting them in the quantitative finance community. We apply our findings to tackle several financially relevant problems, such as a universe of assets displaying exponentially decaying temporal covariances, or the exponentially weighted moving average, both with an arbitrary structure of cross-covariances.     

Informal employment in Poland: an empirical spatial analysis

The main goal of our article is to bridge the gap in the regional analysis of informal employment in Poland and in particular to indicate the propensity for informal work in the working-age population, to test if informal activities are typical for marginalized people (less educated, unemployed, older) and to identify the regional and spatial heterogeneity in the propensity. We use data from the ‘Human Capital Balance 2010–2014’ survey. Results indicate a strong relationship between the probability of informal work and age, sex and labour force status. Moreover, a strong spatial dependency can be observed.     

A Two‐Step Procedure to Measure Representativeness of Internet Data Sources

So far, statistics has mainly relied on information collected from censuses and sample surveys, which are used to produce statistics about selected characteristics of the population. However, because of cost cuts and increasing non‐response in sample surveys, statisticians have started to search for new sources of information, such as registers, Internet data sources (IDSs, i.e. web portals) or big data. Administrative sources are already used for purposes of official statistics, while the suitability of the latter two sources is currently being discussed in the literature. Unfortunately, only a few papers devoted to statistical theory point out methodological problems related to the use of IDSs, particularly in the context of survey methodology. The unknown generation mechanism and the complexity of such data are often neglected in view of their size. Hence, before IDSs can be used for statistical purposes, especially for official statistics, they need to be assessed in terms of such fundamental issues as representativeness, non‐sampling errors or bias. The paper attempts to fill the first gap by proposing a two‐step procedure to measure representativeness of IDSs. The procedure will be exemplified using data about the secondary real estate market in Poland.     

Returns from income strategies in rural Poland

In order to stabilize and improve their income situation, rural households are strongly encouraged to diversify their activities both in and outside the agricultural sector. Often, however, this phenomenon takes on only moderate proportions. This article addresses issues of rural households' income diversification in the case of Poland. It investigates returns from rural households' income strategies using propensity score matching methods and extensive datasets spanning 1998–2008. Results suggest that returns from combining farm and off‐farm activities were lower than returns from concentrating on farming or on self‐employment outside agriculture. This differential is stable over time although returns from diversification have relatively improved after the accession of Poland to the European Union. This is also visible in the fact that since 2006, returns from combining farm and off‐farm activities have equalized with returns from relying solely on hired off‐farm labour, thus smoothing away the difference observed before the accession. Further, over the analysed period, households pursuing a diversification strategy performed better than those relying solely on unearned income. Finally, in general, incomes in households combining farm and off‐farm activities were higher than in those combining off‐farm income sources.     

Negative consequences of deep relationships with suppliers: An exploratory study in Poland

The dark side of buyer–seller relationships may be treated as an under investigated field of research. The main objective of this paper was to explore the negative consequences of being involved in deep supplier relationships. The data gathered from 92 in-depth interviews with purchasing managers were used for the qualitative data analysis. The negative relationship consequences identified in the study were assigned to six categories: supplier-specific forces, buyer-specific forces, relationship-specific forces, product-specific forces, network-specific forces and environment-specific forces.The study extends our knowledge about the negative consequences of deep supplier relationships in Eastern Europe by illustrating the complexity of the factors involved and the complex interactions that influence the context. An exploratory approach was taken which means that findings cannot be generalized to other contexts. However, this creates an avenue for further research.     

GDPR: A Step Towards a User-centric Internet?

While the potential empowering impact of the GDPR is huge, we argue that the ambivalent attitudes of users towards data protection, as well as the risk of differentiation of legal practice among member states, can seriously limit the real effects of the privacy reform.     

Treasury revenue and foreign trade taxation

Zusammenfassung Staatseinnahmen und die Besteuerung des Au\enhandels. — In diesem Aufsatz wird eine vergleichende L?nderstudie durchgeführt, um die fiskalische Bedeutung von Au\enhandelssteuern und deren Beziehung zum Pro-Kopf-Einkommen und zu der Au\enhandelsabh?ngigkeit des Landes zu zeigen. Der Test basiert auf Durchschnittsangaben der Jahre 1972–1978 für 93 L?nder und wird sowohl für die Exporte und Importe zusammen als auch für die Exporte und Importe getrennt durchgeführt. Es zeigt sich, da\ die Einfuhrbesteuerung eine erheblich gr?\ere fiskalische Bedeutung hat als die Ausfuhrbesteuerung. Das gilt sowohl für die Entwicklungsl?nder als auch für die Industriel?nder als Gruppe, obwohl die Exportsteuer für die einzelnen Entwicklungsl?nder ein sehr unterschiedliches Gewicht haben kann. Die fiskalische Bedeutung der Au\enhandelsbesteuerung nimmt ab, wenn das Pro-Kopf-Einkommen ansteigt, jedenfalls dann, wenn eine bestimmte Einkommensschwelle überschritten wird. Diese Hypothese konnte auch aufrechterhalten werden, als im Vergleich zu anderen Studien neuere Daten und eine andere Gruppe von L?ndern benutzt wurden. Die Ergebnisse best?tigen nicht die Behauptung, da\ die Au\enhandelssteuern st?rker als andere Steuern ansteigen, wenn der Au\enhandel an Bedeutung zunimmt.

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Résumé Les recettes publiques et la taxation du commerce extérieur. — Cet article analyse pour beaucoup de pays l’importance fiscale des taxes sur le commerce et sa relation au revenu per capita et à la dépendance d’un pays du commerce extérieur. Le test, basé sur les données moyennes des années 1972–1978 et des 93 pays, est fait pour les exportations et importations ensemble aussi bien que pour les exportations et importations séparément. Le résultat est que la taxation des importations a une considérablement plus importante fonction fiscale que la taxation des exportations. Ce résultat est valable pour les pays développants aussi bien que pour les pays développés, considérés comme groupe, bien que l’importance de la taxation des exportations puisse considérablement varier parmi des PVD individuels. L’importance fiscale des taxes sur le commerce extérieur se reduit si le revenu per capita accro?t, du moins après le revenu excède un certain seuil. Cette hypothèse est aussi approuvée en utilisant des données et des échantillons de pays beaucoup plus récentes que celles des autres études. Les résultats ne confirment pas l’assertion que les taxes sur le commerce extérieur dépassent des autres sortes de taxe si le commerce extérieur accroêt en importance.

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Resumen Ingresos del tresoro y tributación al comercio exterior. — Este es un análisis comparativo a traves de países de la importancia de los impuestos al comercio exterior y su relatión con los ingresos per cápita y la dependencia del país del comercio. El test, basado en promedios para los a?os 1972–1978 y cubriendo 93 países, se conduce tanto para el comercio global de importatión y exportatión como para las exportaciones e importaciones separadamente. El resultado es que la tributación a las importaciones tiene una función fiscal considerablemente más importante que la tributación a las exportaciones. Esto es válido tanto para los países en desarrollo como para los países desarrollados considerados como grupo, a pesar de que la importancia de la tributación a las exportaciones puede variar considerablemente entre países en desarrollo particulares. La importancia fiscal de los impuestos al comercio declina en la medida que el ingreso per cápita aumenta, al menos desde el momento en que éste último sobrepasa un cierto umbral. Esta hipótesis ha sido continuada, utilizando datos y muestras de países mucho más recientes que en otros estudios. Los resultados de este test no confirman la exigencia que los impuestos al comercio exterior aumentan por sobre otros tipos de impuestos en la medida que el comercio exterior crese en importancia.