Tightening the leash after a threat: A multi-level event study on leadership behavior following the financial crisis

This paper presents the results of a multi-level event study of the effects of the 2008 financial crisis on leadership behavior. Following assumptions from the threat-rigidity hypothesis, we expect that across firms and countries, this crisis led to an increase in directive leadership. In line with this hypothesis, we also anticipate that this change is context-specific. The impact of the 2008 financial crisis on the change in directive leadership is analyzed for over 20,000 managers in 980 organizations across 36 countries. We find that the financial crisis went along with a significant increase in directive leadership, and that this effect was stronger in the manufacturing sector, and in countries with a high degree of power distance. Our results support the threat-rigidity hypothesis, and contribute to leadership research by showing that the context is not only a moderator but actually shapes leadership behavior. This opens up a new avenue of leadership research where context is an antecedent of leadership behavior more generally, and where the methodological set-up allows for causal inference.     

The role of vertical conflict in the relationship between leader self-enhancement and leader performance

Although studies have shown that inflated self-perceptions of transformational leadership behavior negatively affect leader performance, insight into the underlying processes explaining this relationship is lacking. The current study addresses this gap by identifying vertical conflict between leaders and subordinates as one such underlying process. Using a sample of 52 leaders supervising 259 subordinates, it was found that leader self-enhancement of transformational leadership behavior is significantly and positively related to vertical conflict about both task and relationship issues. Results further indicate that vertical task conflict rather than vertical relationship conflict mediates the negative relationship between leader self-enhancement and leader performance.     

Approximation hardness of edge dominating set problems

We provide the first interesting explicit lower bounds on efficient approximability for two closely related optimization problems in graphs, MINIMUM EDGE DOMINATING SET and MINIMUM MAXIMAL MATCHING. We show that it is NP-hard to approximate the solution of both problems to within any constant factor smaller than . The result extends with negligible loss to bounded degree graphs and to everywhere dense graphs. An extended abstract of this paper was accepted at the 14th Annual International Symposium on Algorithms and Computation, ISAAC 2003.     

Weighted amplifiers and inapproximability results for Travelling Salesman problem

Journal of Combinatorial Optimization - The expander graph constructions and their variants are the main tool used in gap preserving reductions to prove approximation lower bounds of combinatorial...     

High tick abundance and diversity of tick-borne pathogens in a Finnish city

Urban Ecosystems - The sheep tick Ixodes ricinus is the primary vector for various zoonotic diseases, including Lyme borreliosis and tick-borne encephalitis (TBE), in Europe. Because both abundance...     

How feedback about leadership potential impacts ambition,organizational commitment,and performance

In the present research we report results from two experimental studies that examine how feedback about leadership potential impacts leadership ambition, organizational commitment, and performance. Study 1 used an experimental vignette methodology that controls for prior performance. Results show that individuals who receive feedback that they have low potential to be a future leader have lower ambition and organizational commitment relative to those who receive feedback that they have high potential to be a future leader. Study 2 provides evidence of the causal behavioral effects of feedback about leadership potential using a real task effort environment. Results show that participants informed to be unlikely future leaders display lower performance in a subsequent task than participants informed to be likely future leaders. The findings from the two studies demonstrate that information about leadership potential affects subsequent ambition to become leaders as well as performance. We discuss the implications of these findings for the importance of followership, talent management, and leadership succession.     

Do transformational CEOs always make the difference? The role of TMT feedback seeking behavior

In the present paper, we raise the question whether CEO transformational leadership invariably makes a difference for team performance and change effectiveness. Since in general, CEOs are surrounded by a team of highly influential top managers, we argue that the effectiveness of CEO transformational leadership is contingent on the feedback seeking behavior of their top management team (TMT). Data from 38 TMTs and their CEOs demonstrated that transformational leadership was positively related to both TMT performance and effectiveness of organizational change, but only when the TMT engaged in low levels of feedback seeking behavior. As predicted, there was no relationship between CEO transformational leadership and performance and change effectiveness for teams exhibiting high levels of feedback seeking behavior. These findings suggest that for high-feedback seeking TMTs, organizational results can be achieved without a transformational CEO.