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The purpose of this paper is to provide theory for some popular models and strategies used by practitioners in constructing optimal portfolios. King (2007), for example, advocated adding a diversification term to mean-variance problems to create better portfolios and provided clear empirical evidence that this is beneficial.

The authors provide an analytical framework to help us understand different portfolio construction practices that may incorporate diversification and conviction strategies; this allows us to connect our analysis to ideas in psychophysics and behavioural finance. The critical psychological ideas are cognitive dissonance and entropy; the economics are based on expected utility theory. The empirical section uses the theory outlined and provides the basis for constructing such portfolios.

The model presented allows the incorporation of different strategies within a mean-variance framework, ranging from diversification and conviction strategies to more ESG-oriented ones. The empirical analysis provides a practical application.

To the best of the authors’ knowledge, this model is the first to bridge the gap between portfolio optimisation and the psychological ideas mentioned in a coherent analytical framework.

Environmental concerns are rapidly increasing in the industries across the world. They are a more serious issue, especially, in the developing countries due to the prevalence of old practices and outdated technology. The purpose of this paper is to understand the role of institutional pressure and environmental orientation of the firm in adopting green supply chain management (GSCM) practices, and thereon the effect of GSCM on the firm’s performance.

By employing survey methodology using purposive sampling technique, the data were collected from 229 respondents who were working as supply chain management professionals in various manufacturing firms. The hypotheses were tested through partial least square structural equation modeling (PLS-SEM).

The findings reveal that both institutional pressures and environmental orientation significantly impact GSCM practices. The result further shows that GSCM practices have a positive effect on the environmental and economic performance as well as customer effectiveness.

Industries in the developing economies like Pakistan are reluctant to implement GSCM practices due to the perception of ambiguous financial implications. This study signifies that institutional pressures act as an effective driving force for change management and compliance.

The purpose of the paper is to showcase the significant achievements of Egypt's scientists in the 20th century across various fields of study such as medicine, physics, chemistry, biology, math, geology, astronomy and engineering. The paper highlights the struggles and successes of these scientists, as well as the cultural, social and political factors that influenced their lives and work. The aim is to inspire young people to pursue careers in science and make their own contributions to society by presenting these scientists as role models for hard work and dedication. Ultimately, the paper seeks to promote the importance of science and its impact on society.

The purpose of this review is to present the scientific biographies of Egypt's most distinguished scientists, primarily in the field of Natural Sciences, in a balanced and comprehensive manner. The work is objective, honest and abstract, avoiding any bias or exaggeration. The author provides a clear and concise methodology, including a brief introduction to the scientist and their field of study, an explanation of their major contributions, the impact of their work on society, any challenges or obstacles faced during their career and their lasting legacy. The aim is to showcase the important achievements of these scientists, their impact on their respective fields and to inspire future generations to pursue scientific careers.

The group of outstanding scientists in 20th century Egypt were shaped by various factors, including familial upbringing, education, society, political and cultural atmosphere and state support for scientific research. These scientists made significant contributions to various academic disciplines, including medicine, physics, chemistry, biology, mathematics and engineering. Their impact on their communities and cultures has received international acclaim, making them role models for future generations of scientists and researchers. The history of these scientists highlights the importance of educational investments and supporting scientific research to foster innovation and social progress. The encyclopedia serves as a useful tool for students, instructors and education professionals, preserving Egypt's scientific heritage and honouring the scientists' outstanding accomplishments.

The encyclopedia preserves Egypt's scientific heritage, which has been overlooked for political or other reasons. It is a useful tool for a variety of readers, including students, instructors and education professionals, and it offers insights into universally relevant scientific success factors as well as scientific research methodologies. The encyclopedia honours the outstanding scientific accomplishments of Egyptian researchers and their contributions to the world's scientific community.

The practical implications of this paper are several. First, it highlights the importance of education, family upbringing and societal support for scientific research in fostering innovation and social progress. Second, it underscores the need for continued funding and support for scientific research to maintain and build upon the accomplishments of past generations of scientists. Third, it encourages young people to pursue scientific careers and make their own contributions to society. Fourth, it preserves the scientific heritage of Egypt and honors the contributions of its outstanding scientists. Finally, it serves as a useful tool for students, instructors and education professionals seeking to understand the factors underlying scientific success and research methodologies.

The social implications of the paper include promoting national pride and cultural identity, raising awareness of the importance of education and scientific research in driving social progress, inspiring future generations of scientists and researchers, reducing socioeconomic disparities and emphasizing the role of society, politics and culture in shaping scientific researchers' personalities and interests.

The paper's originality/value lies in its comprehensive documentation of the scientific biographies of Egypt's most prominent scientists in the 20th century, providing unique insights into the factors that contributed to their development and their impact across various academic disciplines. It preserves Egypt's scientific heritage and inspires future generations of scientists and researchers through the promotion of educational investments and scientific research. The encyclopedia serves as a useful tool for education professionals seeking to understand scientific success factors and research methodologies, emphasizing the importance of supportive and inclusive environments for scientific development.

In the presence of informal sector in the country, designing an energy policy and the pursuit of higher economic growth become challenging for emerging economies. These economies are usually resource starved, and the presence of underground economy leads to faulty estimates of energy demand. The authors explore the energy–growth nexus in the presence of underground economy for Pakistan, an emerging economy host to large informal sector and facing recurring energy crises.

The authors evaluate the impact of underground economy on energy demand in the presence of explanatory variables, including official gross domestic product (GDP), foreign direct investment and financial development. The authors first assess the influence of official economy on the consumption of energy. The authors investigate how energy consumption is influenced solely by underground economy. Finally, the authors evaluate the impact of true GDP on the energy consumption. The authors employ combined cointegration method of Bayer and Hanck (2013) and then apply vector error correction model.

The results reveal that official GDP, underground economy and true GDP positively and significantly affect energy consumption in both short and long run. Similarly, financial development as well as foreign direct investment enhance energy consumption. The authors find unidirectional causality between energy consumption and official GDP variables (OGDP → EC), underground economy (UE → EC) and true GDP variables (TGDP → EC) in the long run. The authors observe bidirectional causality in the short run between energy consumption and official GDP (OGDP ↔ EC) and true GDP (TGDP ↔ EC).

To the best of the authors' knowledge, no study examines the causal relationship of energy consumption and underground economy. Overall, the findings assist policymakers to consider and implement different energy-related policies considering the significant role of underground economy for energy consumption in Pakistan.

Motivated by lack of empirical research on sukuk (Islamic bonds) defaults and factors influencing the credit risk in sukuk industry, the study investigates the impact of corporate governance (CG) practices and corporate social sustainability (CS) disclosures on default risk of Islamic bonds in an emerging market.

In the Malaysian context the authors use generalized method of moments (GMM) to examine the mitigating effect of CG structure and CS disclosures on distance to default (DD) of sukuk issuers.

The results show that although both CG and CS have a significant and positive relationship with distance to default, the contribution of CS to augment DD is higher. Moreover, different CG variables have a varied relationship with distance to default, while the association is positive for all three pillars of CS, videlicet economic, social and environmental sustainability.

The findings of the study hold important implications for issuers, subscribers and regulators in the sukuk industry.

Limited research investigates the relationship between CG, CS and default risk of Islamic bonds. In light of this, the study attempts to fill the theoretical void in literature by examining the relationship among the underlying variables.

The purpose of this paper is to integrate the Quality–Loyalty Model and the Religiosity–Loyalty Model to assess loyalty formation toward Halal food.

Data from 320 respondents were collected in Bandung Indonesia through a survey. A partial least-square modeling was employed to evaluate the association between food quality, religiosity, perceived value, satisfaction and loyalty.

This study discloses that the two integrated loyalty models are fit, indicating that incorporating these loyalty models provides a better comprehension of loyalty toward Halal food. Further, this study confirms the importance of both food quality and religiosity in determining loyalty.

This research offers an important finding for Halal food managers to develop customer loyalty through food quality and religiosity. This research recommends that Halal food managers, besides obtaining Halal certification, need to constantly innovate and adopt world food-quality standards to deal with customers’ constantly changing demands.

This research is the first that integrates the Quality–Loyalty Model and the Religiosity–Loyalty Model to get a better understanding of loyalty formation toward Halal food.

The present study aimed at analyzing the hypothesized relationship between human resource (HR) flexibility and firm performance with the mediating effect of firm innovation and the moderating role of firm-level power distance orientation.

The proposed hypotheses were tested with the two-wave data collected from 209 registered information technology (IT) firms operating in Pakistan. The SMART-PLS examined the model’s hypothesized moderated, mediated and moderated-mediation relationships.

The results confirmed significant relationships between HR flexibility, firm innovation and performance while showing that the link between HR flexibility and firm performance is mediated by firm innovation. The results demonstrated that the firm-level power distance orientation negatively affected the HR flexibility–firm innovation link. These findings provide implications on how HR flexibility leverages firm innovation and performance. However, a power distance orientation in firms may diminish the positive effect of HR flexibility.

HR practitioners and top management can leverage these findings to design and implement policies that promote HR flexibility within IT firms for superior innovation and performance.

Our study offers valuable insights into the contribution of HR flexibility to firm innovation and performance. Specifically, the findings indicate that power distance orientation negatively affects the relationships between HR flexibility, firm innovation and performance. Therefore, HR practitioners and top management can leverage these findings to design and implement policies that promote HR flexibility within IT firms for superior innovation and performance.

The study aims to inspect the impact of employees’ perception of corporate social responsibility (CSR) and their spiritual values on their affective commitment and job satisfaction, which in turn may promote organizational citizenship behavior. Furthermore, this study examines the moderating effect of Islamic work ethics to identify whether they strengthen or weaken the proposed associations.

A survey instrument was devised to collect data from employees. The statistical analysis of the data was conducted using the Smart PLS software. Additionally, the research uses the “Partial Least Square-Structural Equation Modelling (PLS-SEM)” technique.

The findings of the study suggest that employees’ perception of CSR exhibits a positive association with affective commitment and job satisfaction. Likewise, employees’ spiritual values demonstrate a positive and significant correlation with affective commitment and job satisfaction. Finally, the outcomes reveal that affective commitment and job satisfaction play a major role in fostering organizational citizenship behavior. Moreover, Islamic work ethics positively and significantly moderate the relationship between employee CSR perception and affective commitment and between employee CSR perception and job satisfaction.

This research study endeavors to fill the gaps in the current literature by investigating two crucial aspects of employees: their perception of CSR and spiritual values. Additionally, the study includes Islamic work ethics as a moderator to provide a more comprehensive understanding of how these factors contribute to fostering organizational citizenship behavior. This work highlights the significance of spiritual values and social responsibilities in employees’ lives and how Islamic work ethics shape their behavior accordingly.

Abusive supervision is found to influence the workplace negatively but how it predicts knowledge hiding behavior is an area that has not gained due attention in the literature. To this backdrop, this study aims to investigate the effect of abusive supervision on knowledge hiding behavior considering future orientation and Islamic work ethics (IWE) as moderators.

The data from 396 employees, working in both manufacturing and service sectors, is collected through a questionnaire-based survey in two-lags between November 2019 and January 2020.

Structural equation modeling highlighted that a positive relationship exists between abusive supervision and knowledge hiding behavior. Moreover, higher levels of IWE and future orientation are found to weaken the said relationship.

This paper provides practical understandings into extenuating the destructive effects of the dark side of leadership (abusive supervision), a prevalent issue in Asian societies, through the lens of personality (future orientation) and belief (IWE).

This study adds value by investigating the relationship between abusive supervision and knowledge hiding by demonstrating the moderating effects of IWE and future orientation in the context of Pakistan.

The purpose of this paper is to explore EFL reading anxiety of first-year undergraduate engineering students and its effect on their reading performance in a public sector engineering university in Pakistan. It specifically aims to explore their top-down, bottom-up and classroom EFL reading anxiety.

Data for the present study were collected from 200 first-year engineering students to explore their reading anxiety. A 20-item questionnaire developed by Zoghi and Alivandivafa (2014) was used to measure students’ EFL reading anxiety, while an IELTS academic reading test was used to measure their reading performance. The data were analyzed through exploratory factorial analysis and multiple regression analysis to determine which type of reading anxiety has a significant effect on students’ reading performance.

It was found that the bottom-up reading anxiety and the classroom reading anxiety have a significant negative impact on the reading performance of the first-year undergraduate engineering students of a Pakistani university. However, top-down reading anxiety has an insignificant negative impact on the reading performance of university students.

The data for the current study were drawn from one Pakistani public sector engineering university, and all the students were first-year undergraduates. The data were collected through a self-reported questionnaire and IELTS (academic) reading test. Some of the students may be unfamiliar with the IELTS test pattern, so their reading performance might have been affected.

Teachers should adopt such a methodology in their EFL classrooms which helps students reduce their reading anxiety. Reading texts must be selected considering the proficiency level of students, and reading strategies must be explicitly taught to reduce bottom-up and top-down reading anxieties. Teachers should create a positive learning environment in their classroom by encouraging students to make an effort to improve their reading skills in order to deal with classroom reading anxiety. Students must be explained that they should help one another rather than ridiculing each other’s reading mistakes. Differentiated instruction can also be adopted to facilitate weak readers. The teachers can provide additional/out of the class support to weak readers in order to help them deal with reading anxiety.

The EFL reading anxiety among university students in the Pakistani context has received little attention from the researchers. Furthermore, although the impact of EFL reading anxiety on EFL students’ reading performance has been explored previously, the impact of three types of EFL reading anxiety on EFL learners’ reading performance has not been adequately investigated.