This paper explores the impact of marketing mix instruments on the students’ satisfaction in faculties in the Republic of Serbia and Spain, with the aim of determining how significant the effects of each marketing mix tool and their combinations are in relation to satisfaction of students in Higher Education Institutions (HEIs). The detailed literature review is provided in the theoretical part, which contributes to a better understanding of terms like marketing in higher education, marketing mix instruments in higher education and students’ satisfaction. Data were collected from 896 respondents, who are all students at the faculties in Serbia and Spain, and were obtained using the questionnaire purposefully composed for this research. The methods used to highlight any gaps in this marketing mix practice and the relative customer–student satisfaction in HEIs are statistical analyses (descriptive analysis, correlation analysis, multiple regression analysis and t-independent samples tests), leading to the general conclusions regarding the following: by improving marketing mix instruments (service, distribution, human factor, physical evidence, service process) we can, and by improving (price, promotion) we cannot, improve students’ satisfaction in higher education institutions. The general conclusions clearly highlight what needs to be improved in practice in higher education institutions to improve students’ satisfaction, especially students’ loyalty, students’ choices, students’ satisfaction with the quality of the marketing mix instruments at the faculty, students’ satisfaction with expectation which they had upon enrolment and student satisfaction with the public image of the faculty, which is the main goal of these institutions.

The goal of the research was to investigate the effect of dietary natural or biotic additives such as garlic, black pepper, and chili pepper powder in poultry nutrition on sustainable and economic efficiency of this type of production. A total of eight dietary treatments with 1200 broiler chickens of hybrid line Hubbard were formed, with four replicates. During the experimental period, chickens were fed with three period mixtures diets of different average costs: Starter compound mixture two weeks (0.38 €/kg in all treatments), grower compound mixture next three weeks (0.36, 0.38, 0.40, 0.41, 0.46, 0.39, 0.42, and 0.39 €/kg, respectively), and finisher compound mixture for the final week (0.34, 0.36, 0.38, 0.39, 0.44, 0.37, 0.40, and 0.37 €/kg, respectively). The experiment lasted a total of 42 days. Upon finishing the experiment, results have shown statistically significant (p < 0.05) differences regarding the European broiler index (EBI) as one of the indicators of economic efficacy. The EBI was lowest in the control treatment (220.4) and significantly higher in experimental treatments (298.6), respectively. In cost, a calculation included the cost of feed and used natural or biotic supplements in chicken nutrition. The findings of the study of economic efficiency revealed that the cost per treatment rises depends on the natural additive used. Economic efficiency analysis showed that the most economical natural additive with the lowest cost is garlic (0.68 €/kg), while the most uneconomical is treatment with black pepper with the highest cost of body weight gain (0.82 €/kg). This higher cost of the gained meat is minimal as a consequence of a much healthier and more nutritious food meant for human use, which often promotes sustainable aspects, compared to conventional and industrialized poultry production.

This research examines the difference in the level of entrepreneurial orientation among university employees within the European Union compared to university employees in non-EU countries. The EU Member States included in the research are the Republic of Slovenia and the Republic of Croatia, and the non-EU countries include the Republic of Serbia, the Republic of Montenegro, the Republic of Bosnia and Herzegovina, and the Republic of Northern Macedonia. In the sample of 1474 respondents, the ENTRE-U scale was used to measure the entrepreneurial orientation of universities, and multivariate analysis of MANOVA variance was used for data processing. The ENTRE-U scale has proven applicable not only to developed countries but also developing countries. Moreover, it proved that being a member of the European Union in this part of Eastern Europe does not significantly affect the entrepreneurial orientation of universities.

First of all, i would like to thank everyone that have helped me to complete my dissertation. It is only thanks to the support, advice and help of the professors, friends, and family, that this dissertation was able to get its final, planned form.Most importantly, i would like to express my deepest gratitude to my professor, mentor, and advisor -Professor Javier Sanchez Garcia, who have provided immense amount of support and advice, and who didn't let me to give up at any moment throughout the dilemmas occurring in the research process. I believe that if it wasn't for his support, i wouldn't be able to finish Ph.D. studies, nor complete the complex process of collecting data and writing dissertation.Always showing understanding and patience for all my occasional mistakes and never ceasing to believe in me, he provided support and motivation for further work, both during the course of studies, and now at the very end of it. I'm sure that i had the unbelievable fortune to have him as my mentor and advisor, who was always there for me, at any moment, like a sincere friend, and whom i have learned so much from in a professional sense, and about life in general.I also would like to thank to my co-mentor, Professor Edgar Breso Esteve, who has also provided support and direction for my work, and who has, together with my mentor, Professor Javier Sanchez Garcia, enabled me to collect valuable data, without which i would not be able to complete the research process. Furthermore i am grateful for Professor Breso's direction and guidelines regarding technical details of dissertation, specifically the ones regarding questionnaire. Moreover, i would like to express my deepest gratitude to Professor Breso for his time and patience in helping me solve any problems that occurred in the research process.Last but not the least, i would like to thank my family and friends: my daughter Petra; my parents, Dušan and Branka; sister Milena and niece Elena; my friends Jovana, Ivana, Aleksandra, Tanja, Marijana and Petra, whose unconditional love and understanding provided me with strength to complete the complex work. I thank them for being my strength and motivation to keep going even through the toughest times.

Wine production is directly related to the environmentally responsible production. In recent years, due to demands for an environmentally responsible wine production in the Republic of Serbia, wine producers have become aware of the environmental responsibilities and are taking measures to prevent environmental problems. The objective of this research was to investigate attitudes of winery owners/managers on business performance of the wineries concerning the environmental behavior and its disclosure. The research has been conducted in the period from July to the end of October 2021 on a sample of 330 small wineries in the Republic of Serbia. The data were processed in the Smart PLS software v.3.2.7. The findings show a positive connection between of both service and financial performance with an ethical environmental behavior and environmental disclosure. However, no positive connection between innovative performance and ethical environmental behavior or ethical environmental disclosure has been determined. The positive attitudes of managers on the environment influence the business performance of wineries and indirectly on environmental behavior and disclosure. The current study should contribute to the relevant literature, as it investigates not only firm behavior in the wine sector, but also the impact of firm performance on the environment.