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The COVID-19 outbreak highlights that many supply chains are exposed to unforeseen disruptions, that risks are unavoidable, and that the international nature of supply chains can seriously disrupt normal operations. Therefore, the need for Supply Chain Resilience (SCRES) is more imperative than ever. Furthermore, collaboration in supply chains may have benefitted the response to the COVID-19 outbreak. The aim of this research is to gain a deeper understanding of how collaboration with both types of horizontal and vertical collaboration in the supply chain affects its resilience.

A thematic analysis of the literature is used to investigate the concepts of both vertical and horizontal collaboration and supply chain resilience separately, then integrating identified themes to understand the relationship between them through a thematic map.

The thematic analysis indicates that the more firms collaborate in the supply chain, the more resilient they will be. Furthermore, both horizontal and vertical collaboration between supply chain partners will enhance resilience. This relationship is positively moderated by governance in the partnership and negatively moderated by competition in the partnership.

This is one of the first papers to provide in-depth insights into how collaboration, with both types of horizontal and vertical collaboration, affects supply chain resilience. Neither of previous articles provide an understanding of how both types of collaboration enables supply chain resilience.

This study aims to explore how horizontal collaboration can help small and micro enterprises within the drink sector through the relational theory lens.

The use of qualitative research methods, including focus groups and interviews, facilitated understanding the horizontal collaboration in micro and small companies within the Welsh brewery industry. Data collection involved conducting three focus groups and 13 interviews within the Welsh brewery sector in the UK. The collaboration phenomena were explained using the three elements of relational theory: relational rents, relational capitals and relational governance.

Micro and small enterprises in the drink sector use collaborative initiatives in building new capabilities to generate relational rents. In addition, relational capitals and relational governance mechanisms were identified to support the horizontal collaboration among these enterprises.

The focus is on only one part of the drinks industry, i.e. the brewery industry; therefore, this study could be extended to other industries within the drink sector or across manufacturing industries.

The micro and small enterprises can collaborate to achieve relational rent, but this collaboration requires strong relational capitals, such as trust. These partners need to change informal governance mechanisms that already exist towards more contractual formal mechanisms.

Prior research has largely focused on vertical collaboration, with limited studies using the relational theory lens to explicate horizontal collaboration phenomena and no previous research in the context of micro and small companies. Relational rents, relational capitals and relational governance mechanisms are studied to provide insights into an effective collaboration in this context.

The purpose of this paper is to investigate how horizontal collaboration aids organisations in responding to modern slavery legislation and in gaining a socially sustainable competitive advantage.

Action research has been conducted in the textiles and fashion industry and a relational perspective adopted to interpret five collaborative initiatives taken to tackle modern slavery (e.g. joint training and supplier audits). The primary engagement has been with a multi-billion pound turnover company and its collaborations with 35 brands/retailers. A non-government organisation and a trade body have also participated.

Successful horizontal collaboration is dependent on both relational capital and effective (formal and informal) governance mechanisms. In collaborating, firms have generated relational rents and reduced costs creating a socially sustainable competitive advantage, as suggested by the relational perspective. Yet, limits to horizontal collaboration also exist.

The focus is on one industry only, hence there is scope to extend the study to other industries or forms of collaboration taking place across industries.

Successful horizontal collaborative relationships rely on actors having a similar mindset and being able to decouple the commercial and sustainability agendas, especially when direct competitors are involved. Further, working with non-business actors can facilitate collaboration and provide knowledge and resources important for overcoming the uncertainty that is manifest when responding to new legislation.

Social sustainability improvements aim to enhance ethical trade and benefit vulnerable workers.

Prior literature has focussed on vertical collaboration with few prior studies of horizontal collaboration, particularly in a socially sustainable supply chain context. Moreover, there has been limited research into modern slavery from a supply chain perspective. Both successful and unsuccessful initiatives are studied, providing insights into (in)effective collaboration.

The purpose of this paper is to develop a comprehensive model for horizontal logistics collaboration (HLC), including the collaboration types, enablers, context influence and performance indicators.

First, this study discusses the currently available typologies and their limitations and defines relevant collaboration classification dimensions. Then, a detailed analysis of each dimension is conducted, including the identification of resulting collaboration types. Next, collaboration enablers and the context influence are discussed, as well as their implications on the logistics system, with a specific focus on agri-food supply chains (AFSCs). Additionally, adequate key performance indicators (KPIs) are selected to evaluate collaboration outcomes. Finally, the horizontal logistics collaboration concept (HLCC) is applied to an illustrative case study from AFSCs.

The results show that HLC is a complex strategy where several elements intervene in the creation of the collaboration scenario. The research also shows that the specific characteristics of AFSCs influence the partners' selection process and increase the importance of partners' similarity and information exchange.

The results provide managers with practical insights into the dynamic nature of HLC both at the operational and relational levels.

This paper provides a theoretical contribution by introducing a new comprehensive model for HLC and a practical typology that allows a deeper understanding of the mechanisms governing different HLC scenarios.

The purpose of this paper is to focuss on customer driven supply chains and what this means for the management of freight transport, a key process in the supply chain as it acts as a physical link between customers and suppliers. It aims to assess whether some of the new collaborative models for transport management are delivering better optimised solutions.

The paper is based on a multi‐dimensional methodological approach, which includes empirical, model building, opinion and archival evidence. Much of the thinking and findings in this paper have been derived from a series of quasi‐delphi discussion sessions with logistics industry experts from three sectors, steel, grocery and construction and experienced academics in the fields of logistics and supply chain management.

The paper sets out to argue that new innovative solutions are emerging for better transport optimisation, that exploit the competitive power of collaboration, both vertically with supply chain partners and horizontally with other logistics service providers (LSPs).

The research was largely focused on the road freight transport industry in the UK and Europe. However, it is felt that similar thinking can be deployed in other settings for alternative transport modes and other geographical regions. From an academic perspective the paper contributes to the notion that supply chain management as well as focussing on vertical coordination and process integration also needs to incorporate the potential considerable power of horizontal collaboration.

In particular it is original in that it highlights how important it is to combine vertical collaboration with horizontal collaboration if better optimised transport solutions are to be achieved. This is of considerable value and interest both to practitioner and academic communities.

Last mile distribution is a crucial element of any supply chain network, and its complexity has challenged established practices and frameworks in the management literature. This is particularly evident when demand surges, as with recent lockdowns due to the COVID-19 pandemic and subsequent demand for home delivery services. Given the importance of this critical component, this study recommends horizontal collaboration as a possible solution for retailers seeking to improve the quality of their services.

This study investigates whether horizontal collaboration should be considered as an option for faster and greener distribution of groceries ordered online. Using the United Kingdom and Greek grocery markets that differ in terms of online grocery penetration, distribution network structure and delivery times, the study discusses how the effectiveness of pooling resources can create positive spillover effects for consumers, businesses and society.

Despite their differences, both markets indicate the need for horizontal collaboration in the highly topical issue of last mile delivery.

Taking a theoretical and practical view in cases of disruption and constant pressure in last mile distribution, horizontal collaboration supports retailers to coordinate routes, increase fleet and vehicle utilisation, reduce traffic and carbon emissions while improving customer satisfaction.

The purpose in this paper is to develop a systematic literature review aiming to reveal innovation opportunities associated with the thematic collaboration and trust in the reverse logistics field.

The authors adopted a parallel analysis approach segregating the systematic literature review papers in two groups at NVivo®, collaboration and trust in the supply chain and collaboration and trust in reverse logistics, aiming to explore in the first group of papers insights for innovation on collaboration and trust in reverse logistics. The content analysis strategy was supported by the knowledge exchange theory described in Gravier et al. (2008).

Reverse logistics is hardly dissociated from broader sustainable supply chain management approaches, which make all considerations on collaboration and trust designed for such approaches valuable and valid for reverse logistics. Collaboration and trust concepts in supply chain and in reverse logistics contexts are quite similar, while collaboration/trust is mandatory for managing networks in sustainable approaches and in reverse logistics, as well. Downstream and upstream, the chain disruptive innovation business models may be developed between focal companies and returns system third-party logistics providers, fourth-party logistics providers or end-customers, in a business-to-customer collaboration approach. Several collaboration technologies are listed in three perspectives: knowledge sharing, knowledge generation and knowledge implementation.

This study uses a specific protocol for the systematic literature review, and due to inclusion and exclusion criteria, other protocols can provide different results. The strategy of analysis under the knowledge exchange perspective may give a type of result different from other perspectives.

This research systematizes the existing knowledge on the collaborations and trust, which is a priority basis for reverse logistics, providing insights to researchers and practitioners in the area and identifying an agenda for future studies.

In the ever-increasing dynamics of global business markets, firms must use all possible sources to innovate continually. This study aims to explore how supply chain innovation can be fostered through joint efforts between firms and their supply chain partners.

At least two areas advocate innovation through external relations, namely, supply chain collaboration and open innovation. This study aims to provide a holistic insight into how vertical and horizontal partnerships can be implemented to help supply chains become more innovative, building upon commonalities and differences between the two areas.

This study proposes a conceptual framework for supply chain innovation based on the following three ambidextrous capabilities: purpose (i.e. knowledge exploration and exploitation), span (horizontal and vertical collaboration) and orientation (i.e. incremental and radical innovation). With five propositions, the link between the three ambidextrous capabilities and supply chain innovation is explained. The implementation of the framework is articulated through an illustrative real-life case.

The concept of open innovation in supply chain settings is progressively essential yet under-researched. This study is an early attempt to draw on the available theories and literature on open innovation and supply chain collaboration and elaborates how supply chains can facilitate and adopt a more open approach toward innovation.

This paper combines the concepts of search depth and cognitive proximity to investigate the impact of intense collaboration with different external agents on firms' innovation performance. It empirically tests whether firms that draw deeply on cognitively proximate collaborative partners are more innovative than those collaborating intensively with cognitively distant partners. It explores whether the impact of each external agent is equally important in determining the innovation output of firms.

Using data from the Irish Community Innovation Survey 2012–2014, this paper employs a probit model to empirically test the impact of collaboration with cognitively proximate and distant sources of external knowledge to establish whether their impact on innovation performance is uniform.

The results show that not all collaborators equally impact firm innovation performance. Firms who indicate that knowledge sourced from backward linkages with suppliers is highly important are more likely to engage in both product and process innovation, with the effect more pronounced for the former. The extent of this is greatest for backward linkages compared to forward, horizontal and public linkages. Public linkages have the weakest impact on innovation output which raises questions from a policy perspective given the focus on university–industry collaboration for innovation. The findings indicate that collaboration with cognitively proximate sources of knowledge benefits firms' innovation output.

The study provides empirical evidence on the role of intense collaboration with cognitively proximate and distant external knowledge sources to explore their impact on the subsequent innovation performance of firms. The results can be used to help shape firm-level innovation policy, and indeed national policy, to promote innovation performance.

This paper aims to investigate the complexity of collaborations in supply chain networks, particularly the influence of horizontal collaborations (e.g. international joint ventures) on vertical collaborations (e.g. supplier–manufacturer partnering relationships).

A multiple case study including four horizontal collaborations and five vertical collaborations within a supply chain network is presented in the context of the Chinese automotive industry. Data interpretation from interviews is structured by key collaborative activities and collaborative behaviors.

The analysis highlights a variety of collaborative behaviors under different types of collaboration and their interaction. The complexity of collaboration is revealed in a range of dimensions including culture diversity, drivers/facilitators, competitive/collaborative advantages and the engagement of all. Collaboration evolves as the structure of the supply chain changes; the key is to appreciate the existence of cooperation, competition and culture conflicts and to manage the trade-offs.

A window of opportunity is presented for future research to investigate the complexity of supply chain collaboration in a wider industrial or geographical context, including statistical validation and comparative analysis.

A contingent view on supply chain collaboration is promoted to practitioners (e.g. international supply chain managers), where collaborative activities should be aligned with the motive and type of business relationships which may change as collaboration develops.

A rare empirical study captures the complexity of supply chain collaboration including the interaction between different forms. A dynamic collaboration approach recognizes the changing process, varying cooperation behaviors as well as characteristics of partners which have not been sufficiently reflected in the literature.