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As global concerns for sustainability have gained traction in all sectors of every economy including agribusiness, the need to investigate the critical barriers that could hamper this novelty has also risen. In that regard, this study presents a comprehensive overview of the dominant barriers encountered by agribusinesses to ensure long-term success through the lenses of a literature review.

The study used a systematic literature review (SLR) of 43 relevant articles. The study applies content analysis to identify and analyze the selected articles. The conceptual framework underlines the three principal barriers to sustainable agribusinesses.

The results from the SLR demonstrates that inadequate financial support, excessive post-harvest loss, gender inequality, non-climate-smart policies and weak institutional controls constitute the major challenges to the sustainability of agribusinesses.

The study is limited in scope to barriers to the sustainability of agribusiness only not the broad spectrum of the concept of agriculture.

This study's uniqueness is twofold. First, it provides a checklist for practice with the goal of addressing problems that hamper the sustainability of agribusinesses. Second, the findings and research gaps in this study are important to support future studies.

The application of circular economy (CE) has received wide coverage in the built environment, including public-private partnership (PPP) infrastructure projects, in recent times. However, current studies and practical implementation of CE are largely associated with construction demolition, waste and recycling management. Few studies exist on circular models and success factors of public infrastructures developed within the PPP contracts. Thus, the main objective of this article is to identify the models and key success factors associated with CE implementation in PPP infrastructure projects.

A systematic review of the literature was undertaken in this study using forty-two (42) peer-reviewed journal articles from Scopus, Web of Science, Google Scholar and PubMed.

The results show that environmental factors, sustainable economic growth, effective stakeholder management, sufficient funding, utilization of low-carbon materials, effective supply chain and procurement strategies facilitate the implementation of CE in PPP infrastructure projects. Key CE business models are centered around the extension of project life cycle value, circular inputs and recycling and reuse of projects.

Although the study presents relevant findings and gaps for further investigations, it has a limited sample size of 42 papers, which is expected to increase as CE gain more prominence in PPP infrastructure management in future.

The findings are relevant for decision-making by PPP practitioners to attain the social, economic and environmental benefits of transitioning to circular infrastructure management.

This study contributes to articulating the key models and measures toward sustainable CE in public infrastructure development.

This study aims mainly to examine the mediating role of public service motivation (PSM) in the relationship between servant leadership and employee performance in the context of Ethiopian public sector organization employees.

A survey design has been used, where all the 154 employees from seven public sector organizations participated. A confirmatory factor analysis employed on the 149 valid responses further validated the hypothesized model.

The study supported the significant relationship between servant leadership, public service motivation and job performance. Moreover, it exhibited a complete mediating effect of public service motivation, on the relationship between servant leadership and an employee's job performance.

The successful mediation of PSM into servant leadership and job performance indicates that the new government must focus on empowering colleagues to have a say in the department-level policy formulation process.

The novelty of this study stems from the fact that it is a rare study that investigates the relationship between PSM and servant leadership and job performance in Africa, particularly in Ethiopia, where a regime change in 2018 triggered a flurry of reforms to the public sector work culture.