Search Results (292)

Public–private partnership (PPP) logistics infrastructure projects have become increasingly prevalent globally. Consequently, the effective management of these projects as their concession periods expire presents a crucial challenge for governments, vital for the sustainable management of PPP logistics infrastructure. This study addresses this challenge by focusing on the pivotal post-concession decision: whether the government should self-operate the mature logistics infrastructure or re-delegate its management to a private entity. Our theoretical model, built on a principal–agent framework, first establishes a social welfare baseline under government self-operation and then analyzes delegated operation under symmetric information, identifying efficiency frontiers. Under symmetric information, we find that government self-operation is more advantageous when its own operational efficiency is sufficiently high, irrespective of the private enterprise’s efficiency; conversely, delegating to an efficient private enterprise is optimal only when government operational efficiency is low. We also demonstrate that if the government can directly specify the demand quantity and service level and delegates operation via a fixed fee, the enterprise can be incentivized to align with the social optimum. However, under asymmetric information, potential welfare gains from delegation are inevitably offset by informational rent and output distortion. We further uncover non-monotonic impacts of parameters like the proportion of low-cost firms on social welfare loss and demonstrate how information asymmetry can indirectly compromise the long-term resilience of the infrastructure. Ultimately, our work asserts that delegation is only superior if its potential efficiency gains sufficiently offset the inherent losses stemming from information asymmetry. Full article

This paper proposes an incentive scheme based on a public–private partnership (PPP) to encourage low-carbon travel behavior by inducing the mode choice shift from private cars to public transit. The scheme involves three key entities: travelers, the government, and the private sector. Travelers can choose between private cars and public transit, producing different emissions. As the leader, the government aims to reduce total emission to a certain level with limited budgets. The private sector, as an intermediary, invests subsidies in low-carbon rewards to attract green travelers and benefits from a larger user pool. A two-layer multi-objective optimization model is proposed, which includes travel time, monetary cost, and emission. The objective of the upper level is to maximize the utilities of the private sector and minimize social costs to the government. The lower layer is the user equilibrium of the travelers. The numerical results obtained through heuristic algorithms demonstrate that the proposed scheme can achieve a triple-win situation, where all stakeholders benefit. Moreover, sensitivity analysis finds that prioritizing pollution control strategies will be beneficial to the government only if the unit pollution control cost coefficient is below a low threshold. Contrary to intuition, larger government subsidies do not necessarily lead to better promotion of low-carbon travel. Full article

This study investigates the empowering role of public–private partnerships (PPPs) in the economic sustainability of waste management (ESW) and the circular industry economy (CIE), specifically in the small, rapidly industrialising Emirate of Ajman, UAE. Embracing a circular economy is vital for the sustainability agenda while forging a transformative commitment to planetary health (PH) in a manner that is especially crucial for small states with limited carrying capabilities. A quantitative methodological orientation is employed in a survey-based research design, followed by the Partial Least Squares Structural Equation Modelling statistical technique to test the hypothesised relationships. Sampling involved the three sub-populations of government employees (n = 123), managers/employees of private waste collection businesses (n = 106), and employees of private industrial waste generation industries (n = 276). Findings indicate that PPP empowerment positively impacts ESW and contributes to the creation of CIE. Moreover, ESW fosters the growth of CIE in Ajman. Notably, the perspectives of government stakeholders differ from those of non-government actors. This research underscores the significance of PPP empowerment in the development of CIE towards SDGs 11, 12, and 17, emphasising the mediating role of ESW between PPPs and CIE in small, rapidly industrialising states. The study recommends that the Ajman government implement training and social initiatives aimed at aligning the sustainability perspectives of all stakeholders involved in waste management to promote the mutual benefits of “people, places, and planet”. Full article

The public–private partnerships (PPP) mode is very popular in public infrastructure projects. The PPP model for sponge city construction (SCC) provides an effective way to curb and manage the increasingly serious ecological water problems in China. The quantitative evaluation of value for money (VFM) is an evaluation method that obtains quantitative values through a certain calculation process. However, the current studies lack a dynamic quantitative evaluation of VFM for the entire life cycle of SCC PPP projects, and cannot observe the impact of key factors on the VFM value. By constructing a system dynamics (SD) model for the VFM quantitative evaluation of SCC PPP projects from the perspective of the whole life cycle, this study can intuitively and transparently observe the impact of key factors (such as discount rate and profit margin) on the evaluation results and feasibility of adopting a PPP model in the project, offering policymakers a tool to mitigate the risks of “Pseudo-PPP” projects. After collecting cases in Anhui province from the China PPP Center, this study constructed a life cycle VFM quantitative evaluation system dynamics model suitable for SCC PPP projects that consist of the public sector comparison (PSC) value and PPP value. The results indicate that the system dynamics model can be effectively applied to the dynamic quantitative evaluation of SCC PPP projects and clarify the influence degree on and sensitivity of various factors to the VFM value. Specifically, when the discount rate increases, the decrease in the PPP value is greater than that in the PSC value, leading to an increase in the VFM value. Moreover, a reasonable profit margin is more sensitive to the VFM value and decreases as the reasonable profit margin increases. In addition, choosing different availability service fee calculation methods will result in varying the adjustment range to a reasonable profit margin that drives the adoption of VFM quantitative evaluation. These research findings have provided a viable dynamic research methodology for the quantitative VFM evaluation of SCC PPP projects. This methodology enables the dynamic visualization and easy determination of the acceptable ranges for relevant factors, offers rational policy recommendations for the quantitative evaluation of key factor values, and thereby effectively prevents PPP project violations, promoting fair and reasonable cooperation between governments and private enterprises. Full article

The vulnerabilities of critical infrastructure and other disruptive events expose urban communities to severe risks. Public–private partnership (PPP) is an intensive cooperation between public and private actors with enhanced and more innovative services and policy outputs that can be achieved in building urban community resilience. Considering the potential of building urban community resilience through PPP, there is a need to assess the performance of using PPP in urban community resilience building. This study aims to develop a model for assessing the performance outcome for building urban community resilience through PPP. A questionnaire survey was conducted with experienced practitioners globally. The fuzzy synthetic evaluation method was used to develop an evaluation tool that could be used to objectively assess performance outcomes of PPP in urban community resilience building. The tool consists of five critical assessment indicators with defined coefficients: “Resilient urban community physical capital (0.270)”, “Well-developed community stakeholder engagement and training policies” (0.215), “Strong urban community disaster resilience PPP policy” (0.202), “Restriction and preservation” (0.197), “Existence of effective urban disaster risks database and PPP communication plan” (0.116). This performance assessment model can be used as a baseline for measuring the performance of PPP in urban community resilience building. Full article

This scientific research presents the most significant aspects of the structural analysis and verification of the main steel railway bridges in Peru in accordance with the American standard. To this end, linear and finite element analyses (FEMs) were performed using calculation notes in MATHCAD and structural validation software (SAP2000, CSI Bridge, IDEA STATICA and GE05), among others, based on on-site inspections, which allowed results to be obtained to analyze, evaluate and determine the structural performance factors (RF) of the main railway bridges in Peru. For this, data obtained from several railway corridors in Peru were taken into consideration, such as the lines of the Southern Railway Train, Central Andean Railway, Huancayo–Huancavelica Railway Train and the Tacna–Arica Train; in addition to the feasibility studies on the Interoceanic Train project: Iquitos–Yurimaguas; projects administered through Public–Private Partnership PPP as well as by the Regionals Government and MTC-Peru. These data were used in order to be able to warn of certain technical aspects that would influence the recommendations for a locomotive replacement project in which new units had different load distributions between the axles, which would make it necessary to review the tracks and bridges of the same in order to determine if they would be able to withstand the new forces safely, as well as to reinforce structural elements according to the material and the structural condition, and finally, to assess the variation in the increase in train speed in some road corridors to achieve a better FRA (Federal Railway Administration) classification of Class 3, where the presence of structures dating back to the last century has been verified as well (1851–1856–1908). Likewise, the seismic criteria and geotechnical conditions of the most representative areas of the country (acceleration 0.30 g) were included in order to also be able to make technical recommendations that would allow us to ensure the useful life of the structure in service, operation and maintenance conditions. Full article

In public–private partnership (PPP) projects, the private sector’s performance is influenced by administrative efficiency, and the impact varies across different contractual dimensions. Existing research mainly focuses on the influence of project governance on project performance, with few scholars delving into the impact of administrative efficiency on the contractual dimensions of PPP projects. To address this gap, this study employs literature analysis to examine the contractual relationships among PPP project stakeholders, identifying four sub-dimensions: responsibility and authority allocation, profit allocation, risk allocation, and accountability. It then investigates the moderating role of administrative efficiency in the relationships between contractual dimensions and project performance, proposing hypotheses and constructing a research model. The findings reveal that all four sub-dimensions of contractual relationships exert significant positive effects on project performance. Specifically, administrative efficiency significantly enhances the positive relationship between responsibility/authority allocation and project performance, as well as between risk allocation and project performance. These results highlight the critical role of administrative efficiency in optimizing contractual mechanisms to improve PPP project outcomes, providing theoretical and practical insights for enhancing contractual governance in PPP projects. Full article

Public-Private Partnerships (PPPs) are essential for accelerating sustainable development as they combine public goals with private sector efficiency, leading to improved service delivery and less financial burden on governments. It is a project delivery model based on long-term contractual arrangements, where the private sector provides services, including engineering, construction, and operation of public infrastructure, taking financial risks. At the project development stage, the private sector carries out a financial risk assessment to ensure economic returns from a PPP investment and secure funding for the project. In this paper, we present a Bayesian Belief Network (BBN)-based model that can be used to assess financial risks, particularly the level of profitability in PPP projects. The proposed model was developed considering PPP projects in the healthcare sector and validated using data on PPP hospital projects in Turkiye. The findings demonstrate that the BBN model is useful for capturing the interdependencies between risks, resulting in different scenarios, and provides effective decision support for investors in PPP projects. This study contributes to the literature by offering a novel application of probabilistic risk assessment to provide a better understanding of interrelated risk factors that may result in different financial scenarios. The model can be used by the private sector to assess risk, estimate profitability, and develop risk mitigation strategies in PPP healthcare projects, which may increase project success, contributing to social, environmental, and economic sustainability. Full article

Urban regeneration projects have been part of urban planning in different cities to recover strategic areas and combat new land consumption. Often, Public-Private Partnerships (PPPs) agreements are signed to meet the demands of these projects. In the Brazilian context, the general PPP law classifies concessions into two types: sponsored concessions or administrative concessions. Urban regeneration projects in the Brazilian context can be carried out through different policies and instruments, such as those in the City Statute. Despite this, there are several obstacles in how these practices are developed, which require greater attention to the enabling environment and the Critical Success Factors (CSFs) that can improve the performance of these public procurement practices. Based on this, this study aims to analyze the Brazilian context of PPP arrangements in urban regeneration projects and the specific case of the “Porto Maravilha” in Rio de Janeiro. To this scope, the study adopts a previously established CSF framework. The data analyzed are derived from secondary sources obtained through documentation collection and primary sources obtained through interviews. Regarding the PPP process, the results indicate financial and execution problems. Concerning the project, which remains unfinished, the results point to a transformation of the port area, but with significant social impacts. Full article

The complexity of decision making about cultural heritage has drawn attention to hybrid and innovative models to support the challenge of its enhancement. In this context, public–private partnership (PPP) has emerged as a promising tool to address the public administration’s lack of financial resources. However, several barriers have hindered the wide application of PPPs to support heritage enhancement initiatives, thus highlighting the need to provide decision-making processes with appropriate methodological tools, especially in contexts such as UNESCO sites, where heritage conservation rises to a global challenge. Based on these premises, the paper proposes a methodological approach to support decision making about implementing PPPs for heritage enhancement in UNESCO sites by evaluating the financial sustainability of different PPP scenarios, while considering their ability to ensure a fair distribution of benefits between the public and the private. After providing a comprehensive picture of the relationship between PPPs and UNESCO sites in Italy, such an approach was tested on a case study, the “I Sassi di Matera” site that, over the last decades, has made PPPs a central tool for its enhancement strategy. The test results reveal the opportunities of the proposed approach to inform decision making and delve into PPP’s potential for heritage enhancement while outlining the related future research perspectives to ensure its broad scalability to other UNESCO contexts. Full article

Considering the inherent characteristics of long-term agreements, public–private partnership (PPP) projects are confronted with diverse uncertainties and external challenges. However, existing research has devoted limited attention to the resilience of PPP projects. This study seeks to identify governance factors influencing PPP project resilience and analyze the interconnections among these factors in fostering such resilience. A governance framework for PPP project resilience is proposed, comprising thirteen governance factors across four dimensions: institutional, organizational, contractual, and managerial factors. The interpretive structural modeling (ISM) and decision-making trial and evaluation laboratory (DEMATEL) techniques are adopted to explore the hierarchical relationships and interactive mechanisms among these governance factors in a systematic view. The findings reveal that strategic alliances, risk allocation and transfer, flexible contracting, and long-term relationship management represent core governance factors critical to enhancing project resilience. Institutional factors are identified as the most foundational determinants within the governance system, while contractual and managerial factors act as mediating elements facilitating the translation of institutional foundations into operational resilience. This study deepened the understanding of the practitioners with regard to the key governance factors and their inter-relationships, which can help systematically enhance the resilience of PPP projects. Full article

Public–Private Partnerships (PPPs) are widely used for delivering public assets and associated services. A well-developed business case is crucial for the successful execution of PPP projects. This research conducts a comparative study of the critical factors influencing PPP business case development and proposes practical policies and management interventions to enhance this process. Using a systematic literature review and semi-structured interviews with 46 PPP stakeholders from China and New Zealand, the study identifies four key areas essential for an improved business case development: (1) contextual factors, including political support and enabling legal and regulatory frameworks; (2) procedural factors, such as comprehensive service need analysis, robust procurement option assessment, and clear affordability analysis; (3) capability-related factors, including strong public sector capability and credibility; and (4) organizational factors, such as streamlined institutional arrangements and effective governance structures. By adopting the proposed strategies, policymakers can make more informed decisions on PPP-related policies, while public procuring authorities will be better equipped to plan, structure, and manage the business case process effectively. The research focused on PPP practices in two countries, China and New Zealand, with findings derived from a limited number of interviews. This raises questions about the generalizability of the results. Additionally, the recommendations may need to be adapted to account for varying economic, social, and policy contexts when applied in different settings. Full article

As global energy demand grows and the focus on environmental sustainability intensifies, wind energy, as a form of clean energy, plays a pivotal role in the global energy transition. The public–private partnership (PPP) model, by integrating resources from both the public and private sectors, effectively propels the implementation of wind energy projects. However, these projects face a myriad of risks during both development and operation, making effective risk management crucial to project success. This paper, through literature analysis and System Dynamics methodology, develops a risk diversification indicator system that covers the entire project lifecycle. In addition, by combining the improved G1 weighting method and the entropy method, a dynamic risk model is established. Furthermore, through numerical simulation and sensitivity analysis, the risk levels of each subsystem and the key boundary risk factors are identified, and a set of highly adaptable risk diversification strategies is proposed. These strategies will enhance the resilience of wind energy PPP projects, foster trust among stakeholders, help participants effectively respond to and predict risk evolution, improve the project’s risk tolerance, and ensure its long-term sustainable operation. Full article

Traditional centralized energy grids struggle to meet urban areas’ increasingly complex energy demands, necessitating the development of more sustainable and resilient energy solutions. Smart microgrids offer a decentralized approach that enhances energy efficiency, facilitates the integration of renewable energy sources, and improves urban resilience. This study follows a systematic review approach, analyzing the literature published in peer-reviewed journals, conference proceedings, and industry reports between 2011 and 2025. The research draws from academic publications of energy institutions alongside regulatory reports, examining actual smart microgrid deployments in San Diego, Barcelona, and Seoul. Additionally, this article provides real-world case studies from New York and London, showcasing successful and unsuccessful smart microgrid deployments. The Brooklyn Microgrid in New York demonstrates peer-to-peer energy trading, while London faces regulations and funding challenges in its decentralized energy systems. The paper also explores economic and policy frameworks such as public–private partnerships (PPPs), localized energy markets, and standardized regulatory models to enable microgrid adoption at scale. While PPPs provide financial and infrastructural support for microgrid deployment, they also introduce stakeholder alignment and regulatory compliance complexities. Countries like Germany and India have successfully used PPPs for smart microgrid development, leveraging low-interest loans, government incentives, and regulatory mechanisms to encourage innovation and adoption of smart microgrid technologies. In addition, the review examines new trends like the utilization of AI and quantum computing to optimize energy, peer-to-peer energy trading, and climate resilient design before outlining a future research agenda focused on cybersecurity, decarbonization, and the inclusion of new technology. Contributions include the development of a modular and scalable microgrid framework, innovative hybrid storage systems, and a performance-based policy model suited to the urban environment. These contributions help to fill the gap between what is possible today and what is needed for future sustainable urban energy systems and create the foundation for resilient cities of the next century. Full article

Emergency medical services (EMSs) are critical to reducing fatalities and improving patient outcomes in emergencies such as traffic accidents, where response time is a decisive factor. This study proposes a comprehensive and systematic approach to designing and optimizing EMS systems tailored for urban traffic accidents. By integrating Geographic Information Systems (GISs), hypercube queuing models, Economic Value Added (EVA) calculations, and multi-criteria decision-making (MCDM) techniques, we developed a model that balances service efficiency, financial sustainability, and equitable access to emergency care. The hypercube queuing model was applied to estimate key performance metrics, such as response time, coverage, and the GINI index for equity, under varying numbers of ambulances and demand scenarios. In addition, EVA was calculated for different configurations of leased and owned ambulances, offering a financial perspective to assess the viability of public–private partnerships (PPPs) in EMSs. Using the fuzzy Analytic Hierarchy Process (AHP) and CoCoSo (Combined Compromise Solution) methods, this study identified the optimal number of ambulances required to minimize response time, maximize coverage, and ensure financial sustainability. The proposed approach has been applied to a real case in Colombia. Furthermore, integrating leased ambulances offers a financially viable solution with positive EVA values that guarantee the long-term sustainability of the public–private partnership. This paper advances the literature by providing a practical framework for optimizing EMS systems, particularly in developing countries where financial constraints and resource limitations represent significant challenges. The proposed methodology improves service efficiency and economic sustainability and ensures equity in access to life-saving care. Full article