Over the past decade, ethical leadership has increasingly become one of the most popular topics in the areas of leadership and business ethics. As a result, there now exists a substantial body of empirical research addressing ethical leadership issues, but the findings reported by this body of research are highly fragmented. The topic has advanced to the stage where a review and synthesis of existing literature can provide great value and help move the scholarly conversation forward. The primary purposes of this article are to (a) review empirical findings from the ethical leadership literature utilizing a framework consisting of the antecedents, mediators, moderators and outcomes of ethical leadership, and (b) suggest a set of interesting research opportunities, thereby facilitating future investigation. We base our synthesis on a review of 62 empirical studies on ethical leadership that were published between 2005 and mid-2015.

Purpose: The purpose of this paper is to examine the role of supply chain integration (SCI) in improving sustainability management practices (SMPs) and performance.Design/methodology/approach: Based on data collected from 931 manufacturing firms in multiple countries and regions, the authors conducted a structural equation modeling analysis to test the proposed hypotheses.Findings: The findings suggest that supplier and customer integration are vital enablers for both intra- and inter-organizational SMPs. The results also reveal that both intra- and inter-organizational SMPs are significantly and positively associated with sustainability performance (i.e. economic, environmental and social performance) and function as complements to jointly enhance environmental and social performance.Originality/value: This study incorporates SCI into the sustainability literature, providing a new perspective on sustainability and supply chain management research.

Purpose: The purpose of this paper is to examine the antecedents of supply chain integration (SCI) at the product level. More specifically, it aims to show the relationship between product-level characteristics (i.e. product complexity and product variety) and different dimensions of SCI (i.e. internal, supplier and customer integration).Design/methodology/approach: A survey-based research design is developed to measure different dimensions of SCI, product complexity and product variety. The authors use structural equation modelling to test the related hypotheses.Findings: This research shows that internal integration is an enabler to supplier and customer integration. The results also show that under high product complexity, firms tend to implement internal and supplier integration, while product complexity does not have a direct impact on customer integration. Product variety is confirmed to be positively related to all dimensions of SCI.Originality/value: This paper contributes to the SCI literature by first, providing empirical evidence which supports the study of the product design-supply chain interface; and second, exploring the relationships between product complexity, variety and internal, supplier and customer integration based on a governance view.

Purpose: The purpose of this paper is to scrutinize the performance effects of supply chain risk management (SCRM). Besides financial performance, two aspects of operational performance are examined: operational efficiency and flexibility. Moreover, the authors explore the moderating role of supplier integration in the relationship between SCRM and operational performance. Design/methodology/approach: A survey-based methodology was adopted. Based on the data from an international survey, this study applied the structural equation modeling and latent moderated structural equations approach to test the hypotheses. Findings: The results indicate that SCRM positively influences both operational efficiency and flexibility, and has an indirect effect on financial performance. In addition, supplier integration enhances the impact of SCRM on operational flexibility, but does not moderate the relationship between SCRM and operational efficiency. Originality/value: This study extends the existing literature by providing a comprehensive analysis of the performance effects of SCRM. It also provides managerial insights on both risk management and supplier integration.

Manufacturers have extensively recognised the strategic importance of quality and environmental management. However, there is little guidance on how they adopt and exercise both management practices in a way that enhances firms’ performance outcomes. To fill the research gap, this paper empirically investigates the relationships among mimetic pressures, a firm’s quality management practices (QMPs), environmental management system (EMS), and environmental and financial performances. By using a data set collected from 212 U.S. manufacturing firms, this study examines the proposed hypotheses. Our major findings are: first, mimetic pressures are a driving factor for EMS but do not motivate the adoption of QMPs; second, QMPs are an important enabler not only for enhancing firms’ financial performance but also for promoting EMS and environmental performance; and finally, EMS does not influence firms’ financial performance directly, but indirectly does so through enhancing environmental performance. This study contributes to the literature of quality and environmental management and provides practical implications by addressing motivating factors of both QMPs and EMS, and identifying factors for successful environmental management practices.