Metody Ilościowe w Badaniach Ekonomicznych

Testing the Validity of the Purchasing Power Parity (PPP) Hypothesis for Türkiye: Linear and Nonlinear Unit Root Tests

Gülşah Sedefoğlu — 2024-03-26

In this paper, we test the validity of the purchasing power parity (PPP) hypothesis between Türkiye and its trading partners the European Union, China, and the US for the period from January 2001 to January 2020. We test the stationarity of the real exchange rates for the validity of the PPP hypothesis by applying linear and nonlinear unit root tests. We also employ Fourier-based tests to account for the structural changes that occurred in the considered period. Test results indicate that shocks are temporary, and the PPP hypothesis is valid for Türkiye.

On joint distribution of bids in some k-th price auction model

Michał Stachura — 2024-03-26

In the era of increasingly widespread use of electronic communication tools, constant growth of e-commerce turnover is hardly surprising. One of its mechanisms are online auctions whose turnover, on a global scale, is enormous. This paper proposes a stochastic model of the value of subsequent actual bids appearing in the course of a dynamic internet k-th price auction. On this basis, it was possible to determine unconditional joint probability distributions, as well as univariate marginal distributions of successive bids appearing in the course of the auction type under consideration.

Does Gender Diversity in Management Matter? The Case Based on Polish Companies from Ranking Published by Puls Biznesu

Zuzanna Zawolska — 2024-03-26

This article examines the relationship between gender diversity in statutory bodies and woman’s odds of being a business leaders in Poland. Under the empirical framework we assume that gender diversity in the boardroom can improve the quality of work and lead to better decision-making, thus affect financial outcomes and increase the probability that a female director will be rewarded by an external institution. The sample consists of 82 firms from the "Business Women" plebiscite organized by Puls Biznesu in 2012-2021. Our dataset contains information on the members of statutory bodies, i.e.: gender, age, tenure, and function, as well as financial and organizational characteristics of the companies. The variables were collected manually from the InfoVeriti database and EMIS database. We measure gender diversity on boards using Herfindahl – Hirschman Index. Drawing on critical mass theory by measuring gender diversity as levels of female representation in the boardroom, this study finds a positive and significant relationship between gender diversity and the laureate's ranking position