Forecasting high-frequency excess stock returns via data analytics and machine learning

Borsa Istanbul introduced data analytics to present additional information about its market conditions. We examine whether this product can be utilized via various machine learning methods to predict intraday excess returns. Accordingly, these analytics provide significant prediction ratios above 50% with ideal profit ratios that can reach up to 33%. Among all the methods considered, XGBoost (logistic regression) performs better in predicting excess returns in the long-term analysis (short-term analysis). Results provide evidence for the benefits of both the analytics and the machine learning methods and raise further discussion on the semistrong market efficiency.     

Advertising Benefits from Ethical Artificial Intelligence Algorithmic Purchase Decision Pathways

Journal of Business Ethics - Artificial intelligence (AI) has dramatically changed the way organizations communicate, understand, and interact with their potential consumers. In the context of this...     

Innovation in Labour Organisation and Social Conditionality: Implications for Farm Advisory Services

There is growing concern about the evolution of working conditions for employees on European farms. In the new Common Agriculture Policy (CAP), financial support to farmers will soon be subject to a social conditionality clause. As a result of this change in CAP regulations, in this paper we ask if the need for specific advice can already be foreseen? Examining recent investigations that focused on new forms of labour organisations on farms can help to answer this question. Investigations were conducted across France, combining qualitative field studies with a comprehensive analysis of statistical and administrative data. The results show a growing complexity of farm labour organisation that generates needs for new types of advice. In particular, an increasing proportion of the people working on farms are employed by another organisation (foreign and domestic service providers, employers’ alliances, etc.). The administrative data provides strong evidence of the scale of this trend which has little visibility in the agricultural census data. We should therefore be cautious about oversimplified representations of labour patterns at farm level. They can distort policy design, implementation and assessment by overlooking a part of the worker population and needs for new types of advice, including those that will be required to meet social conditionality requirements.     

Trade diversion effects of the US–China trade war on Vietnam

This paper empirically examines the US–China trade war that began in mid-2018, focusing on the impact on a third country, Vietnam. Using regression analysis, we found that while the trade war had a negative impact on US imports from China for all targeted products, there was a partial offset from increased imports from other countries. Notably, US imports from Vietnam experienced a sharp increase, particularly after the third round of US import tariffs on Chinese goods. Additionally, our research reveals that the four rounds of tariff escalation affected US imports from China differently depending on their end-use and technology intensity.     

The impacts of women's land ownership: Evidence from Vietnam

Women's equal access to and control over economic resources such as land are integral to achieve gender equality and sustainable economic development. This study evaluates the impacts of women's land ownership on various women's and household's outcomes in the context of Vietnam. We discuss the beneficial effects of allowing women to own more land on both women and their families. In particular, there is a positive association between women's land ownership and intra-household bargaining power in various aspects. In particular, the relationship is the strongest for women's autonomy in decisions regarding their children. It is also easier for land-holding women to formally access credit and invest in human capital. We further study the favorable effects of women's land ownership on their families in terms of spending and saving behaviors. Finally, women's land ownership also contributes to household social capital. These findings lend support to the passage and implementation of laws intended to grant women equal rights to the ownership and control over land.     

Racial/ethnic match and student–teacher relationships

This paper explores the role of teacher race/ethnicity in the teacher-perceived relationships with kindergarten and early elementary school students. Employing a model with both student and teacher fixed effects, we discover a positive link between the racial/ethnic match and the teacher-reported relationships with students. Specifically, minority students tend to have closer relationships with their teachers when they are taught by a minority teacher. Our analyses also provide suggestive evidence that the effects on the teacher–student relationships could not be driven by differential racial discrimination between white and minority teachers. Particularly, white and minority teachers are not differentially biased in judging their relationships with minority students, implying that the source of the racial/ethnic interaction effects is likely to come from the role modeling of behaviors. Given the importance of the relationships between young children and nonparental adults in their early stages of life, these findings have crucial policy implications.     

Psychological safety climate and workplace bullying in Vietnam’s public sector

The bureaucratic and impersonal nature of public management can fertilize workplace bullying and risks for psychological health and safety. Psychological safety climate (PSC) is an important indicator to reduce psychological hazards. Yet, there have been few studies conducted to examine the existence of PSC in the public sector in non-Western economies. This study examined the implementation of PSC and its effects on 274 employees from six branches of a Vietnamese public sector organization. The results suggest that senior management in organizations should consider positive work conditions and an effective system of policies, procedures, and practices for the prevention of psychosocial hazards.     

Firm size,profitability, and savings in Canada

This paper explores the relationship between firm size, profitability, and corporate savings behavior in Canada. It shows that the long-run propensities to save out of profits are much the same for firms of all sizes, although foreign-owned firms generally retain more of their profits compared to domestic firms. Profitability has also been found to be largely independent of variations in firm size, although large foreign-owned firms generally earn higher profits than large domestic firms. The study also finds no evidence for the superiority of the “dividend effect” over the “retained effect”. It is suggested that the relatively high debt ratio experienced by small domestic firms might be better explained by the demand than the supply side of the markets for new equity.     

Research collaboration model in academic social networks

ABSTRACT

This paper proposes a hybrid collaboration recommendation method that accounts for research similarities and the previous research cooperation network. Research cooperation is measured by combining the collaboration time and the number of co-authors who already collaborated with at least one scientist. Research similarity is based on authors’ previous publications and academic events they attended. A weighted directed graph is built to discover new collaborators by using direct and indirect connections between scientists. Moreover, a consensus-based system is built to integrate bibliography data from different sources. The experimental results show that our method improves the recommendation performances over other methods.