Bio

Joacim serves as Program Director of the Firm Competitiveness program at the Research Institute of Industrial Economics (IFN), and is a Distinguished Visiting Professor at Hanken School of Economics. He works on bringing Swedish registry data to the research frontier in Labor and Finance. A central question in his research is how to enhance the competitiveness of firms and the economy by ensuring the right people create, own, control, and work in the right firms. His work encompasses over 35 publications and working papers in journals such as the The Journal of Finance, Journal of Labor Economics, and Research Policy. It has won multiple awards, has over 1800 citations on Google Scholar, has a top decile ranking for all-time downloads worldwide on SSRN, and has been frequently featured in national and international media. Contact him via email at joacim.tag@ifn.se, phone at +46 73 033 7977, or follow him on LinkedIn (@joacimtag) or BlueSky (@jtag.se).

Now

Right now I am working on revising JAQ of All Trades: Job Mismatch, Firm Productivity and Managerial Quality for Journal of Financial Economics and undertaking a comprehensive revision of the working paper Technology Transfer in Mergers and Acquisitions and the Careers of Workers. I am also developing a PhD course in Labor and Finance that I will teach in November at Hanken, and I am on the Steering Group for the Nordic Microdata Database and the IFN FAME Database. You can find PDFs of all my recent articles here, working papers here, lectures here, and presentations here.

Selected Research

Coraggio, Luca, Marco Pagano, Annalisa Scognamiglio and Joacim Tåg. 2024.”JAQ of All Trades: Job Mismatch, Firm Productivity and Managerial Quality” IFN Working Paper No. 1427, June. https://dx.doi.org/10.2139/ssrn.4069721. Revise and resubmit at Journal of Financial Economics.

• We develop a novel measure of job-worker allocation quality (JAQ) by exploiting employer-employee data with machine learning techniques. Based on our measure, the quality of job-worker matching correlates positively with individual labor earnings and firm productivity, as well as with market competition, non-family firm status and employees’ human capital. Management turns out to play a key role in job-worker matching: when existing managers are replaced by better ones, the quality of rank-and-file workers' job matches improves. JAQ can be constructed for any employer-employee data including workers' occupations, and used to explore research questions in corporate finance and organization economics.

Olsson, Martin, and Joacim Tåg. Forthcoming.”What Is the Cost of Privatization for Workers?” The Journal of Finance.

• The privatization of state-owned enterprises is on the agenda of policymakers across the globe. Using rich administrative data on firms and workers covering two decades, we study how privatization affects the careers and welfare of workers. Consistent with the effects of an initial reorganization of the workforce, wage income declines and unemployment increases. These effects are stronger for workers protected by state ownership. We do not find negative spillovers on family and health outcomes. We also demonstrate that privatization encourages workers to enter entrepreneurship. The firm-level productivity gains from privatization are approximately five times larger than the incumbent worker-level costs due to lost wage income.

Keloharju, Matti, Samuli Knüpfer, Dagmar Müller, and Joacim Tåg. 2024. “PhD Studies Hurt Mental Health, but Less Than Previously Feared.” Research Policy 53(8):105078. https://doi.org/10.1016/j.respol.2024.105078

• We study the mental health of PhD students in Sweden using comprehensive administrative data on prescriptions, specialist care visits, hospitalizations, and causes of death. We find that about 7 % (5 %) of PhD students receive medication or diagnosis for depression (anxiety) in a given year. These prevalence rates are less than one-third of the earlier reported survey-based estimates, and even after adjusting for difference in methodology, 43 % (72 %) of the rates in the literature. Nevertheless, PhD students still fare worse than their peers not pursuing graduate studies. Our difference-in-differences research design attributes all of this health disadvantage to the time in the PhD program. This deterioration suggests doctoral studies causally affect mental health.

Keloharju, Matti, Samuli Knüpfer, and Joacim Tåg. 2023. “CEO Health.” The Leadership Quarterly 34(3): 101672. https://doi.org/10.1016/j.leaqua.2022.101672.

• Using comprehensive data on 28 cohorts in Sweden, we analyze CEO health and its determinants and outcomes. We find CEOs are in much better health than the population and on par with other high-skill professionals. These results apply in particular to mental health and to CEOs of larger companies. We explore three mechanisms that can account for CEOs’ robust health. First, we find health predicts appointment to a CEO position. Second, the CEO position has no discernible impact on the health of its holder. Third, poor health is associated with greater CEO turnover. Poor CEO health also predicts poor firm outcomes: we find a statistically significant association between mental health and corporate performance for smaller-firm CEOs.

Olsson, Martin, and Joacim Tåg. 2017. “Private Equity, Layoffs, and Job Polarization.” Journal of Labor Economics 35 (3): 697–754. https://doi.org/10.1086/690712.

• Private equity firms are often criticized for laying off workers, but the evidence on who loses their jobs and why is scarce. We argue that ownership change is one driver of job polarization by showing that private equity buyouts of low productive firms are coupled with productivity enhancing investments in automation and offshoring. As a result, workers performing routine or offshorable job tasks in these firms tend to get laid off.