OVERCONFIDENCE AND TRADING VOLUME: EVIDENCE FROM AN EMERGENT MARKET

It has been a challenge for financial economists to explain some stylized factsobserved in securities markets, among them, high levels of trading volume. The mostprominent explanation of excess volume is overconfidence. High market returns makeinvestors overconfident and as a consequence, these investors trade more subsequently andmake some transactions more aggressively. The aim of our paper is to study the impact of thephenomenon of overconfidence on the trading volume and its role in the formation of theexcess volume on the Tunisian stock market. Based on the work of Statman, Thorley andVorkink (2006) and by using VAR models and impulse response functions, we find a littleevidence of the overconfidence hypothesis when we use volume (shares traded) as proxy oftrading volume.overconfidence, disposition effect, trading volume, emergent market

Effect of Transformational and Transactional leadership Style on Employees’ Performance in Lebanese Universities

The effectiveness of individual employee’ performance depends on the leader/supervisor. Effective leader can enhance the individual employee performance through proper leadership style and retain high performance and talent employees within the company. The behavior of leader is very importance to improve job performance and retain skillful employees for longer period in the organization. This study aims to investigate the effect of transformational leadership and transactional leadership styles on employees’ performance in Lebanese Universities. Three main variables consist in conceptual framework. They are independent variables (transformational leadership style, transactional leadership style and dependent variable (employee performance).  A sample of 400 respondents has been randomly selected from top four universities in Lebanon. Sample was selected by using simple random method and primary data was collected through structured questionnaires. Data analysis was conducted by using Statistical Package for Social Sciences (SPSS 23.0) and Smart-PLS 3.0. Results showed that both transformational leadership and transactional leadership styles have the significant effect on employees, performance in Lebanese universities. The outcomes of this study offered substantial empirical support to the research framework from a theoretical and managerial perspective

Spontaneous Pneumothoraces and Hemothoraces in Sarcomas

Spontaneous pneumothoraces and hemothoraces are rare manifestations of sarcomas occurring more commonly in specific histologic types, chemotherapy and/or anti-angiogenic therapy. Early identification of spontaneous pneumothoraces and hemothoraces improves the clinical outcomes. In this article, we present a case series of three patients with soft tissue and bone sarcomas who developed spontaneous pneumothoraces and/or hemothoraces and discuss the current literature highlighting the evidence behind these complications