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PublicationArticle (with peer review)

Asymmetric dynamics between uncertainty and unemployment flows in the United States

Abstract

This paper examines how different uncertainty measures affect the unemployment level, inflow, and outflow in the U.S. across all states of the business cycle. We employ linear and nonlinear causality-in-quantile tests to capture a complete picture of the effect of uncertainty on U.S. unemployment. To verify whether there are any common effects across different uncertainty measures, we use monthly data on four uncertainty measures and on U.S. unemployment from January 1997 to August 2018. Our results corroborate the general predictions from a search and matching framework of how uncertainty affects unemployment and its flows. Fluctuations in uncertainty generate increases (upper-quantile changes) in the unemployment level and in the inflow. Conversely, shocks to uncertainty have a negative impact on U.S. unemployment outflow. Therefore, the effect of uncertainty is asymmetric depending on the states (quantiles) of U.S. unemployment and on the adopted unemployment measure. Our findings suggest state-contingent policies to stabilize the unemployment level when large uncertainty shocks occur.

Read the article here.

Ahmed, A., Granberg, M., Troster, V., & Uddin, G. S. (2022). Asymmetric dynamics between uncertainty and unemployment flows in the United States. Studies in Nonlinear Dynamics & Econometrics, 26(1), 155-172.

Details

Author
Ahmed, A., Granberg, M., Troster, V., & Uddin, G. S.
Publication year
2022
Published in

Studies in Nonlinear Dynamics & Econometrics, 26(1), 155-172.


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Article (with peer review)

Principal instructional leadership and teacher collaboration: A longitudinal study of the influence on pupil achievement

Persson, R., Demir, E. K., & Wennberg, K.
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Publication year

2025

Published in

Educational Management Administration & Leadership

Abstract

We study the effects of principal instructional leadership on pupil educational achievement using longitudinal data of 120,394 teacher responses across 1919 schools in Sweden over 9 years. Through multilevel structural equation modelling, we test how teacher ratings of principal leadership influence indicators of educational achievement and the extent to which this effect is channelled through a collaborative teacher culture in schools. Findings suggest that teacher collaboration partly mediates the relationship between principal instructional leadership and pupil educational achievement in terms of final year grade point average. However, concerning final year standardised test scores, principal instructional leadership alone has a stronger relationship to school performance than teacher collaboration. The longitudinal analysis suggests these patterns are driven by relatively stable differences between schools rather than dynamic changes in schools over time, indicating that variation in school contexts such as culture, organisational structure, and leadership practices persist over time. We discuss implications for research, practice, and policy on school leadership and teacher collaboration.

Article (with peer review)

Director turnover in new venture boards: From homophilous to resource-contingent processes

Balachandran, C., & Wennberg, K.
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Publication year

2025

Published in

Journal of Business Venturing

Abstract

Boards are a vital resource for early-stage ventures, offering advice, funding connections, and strategic guidance — especially when directors bring diverse expertise. Yet, as ventures grow and succeed, that diversity can erode. Our study of over 28,000 Swedish ownermanaged firms shows that directors whose expertise differs from that of the founder(s) are more likely to leave—not during hardship, but when the business is performing well. Interviews with several founders and directors further suggest that as ventures mature, they increasingly rely on internal capabilities and shift toward boards that reflect the founder’s evolving preferences. These dynamics lead to more homogenous boards over time, potentially narrowing the range of perspectives available in the board. For founders and policymakers, the findings highlight a key challenge: keeping diverse directors around not just at the start, but as the company scales.

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