Ratio Working Paper No. 240: Bloc - party Politics and Economic Outcomes. What Are the Effects of Local Parties? - Ratio

Ratio Working Paper No. 240: Bloc - party Politics and Economic Outcomes. What Are the Effects of Local Parties? - Ratio

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City size, employer concentration, and wage income inequality

Halvarsson, D., & Korpi, M.

Publication year

2025

Published in

Institute for Evaluation of Labour Market and Education Policy (IFAU)

Abstract

This study investigates the relationship between the urban wage premium and employer concentration using Swedish full population employer-employee data. Departing from an AKM modeling framework to distinguish worker from firm specific heterogeneity – a measure of rent-sharing – we then measure the urban wage premium using differences in the estimated firm fixed effects at the level of local industries, nested within local labor markets. Our results suggest that labor market employer concentration, as calculated using the Hirschman-Herfindahl index and a leave-one-out instrumental variable design, can account for a significant share of the estimated urban wage premium (UWP). Addressing city-level wage income inequality by applying our model to different segments of the local labor market income distribution, we find that while the UWP pertains to all income segments, it is largest for top-income levels (above the 90th percentile), and within this segment employer concentration also has the largest explanatory power. Thus, while being an important explanatory factor for all percentiles of the local income distribution, a relatively lower employer concentration within larger cities, and vice versa, higher concentration within smaller cities, primarily help explain the variance of top wages within these cities/labor markets.

Article (with peer review)

Introducing the inverted Icarus paradox in business history – Evidence from David and Goliath in the Swedish telecommunications industry 1981–1990

Eriksson, K.; Lakomaa, E.; Nykvist, R.; Sandström, C.

Publication year

2024

Published in

Business History, Advance online publication.

Abstract

Previous research in business and management history has identified the Icarus paradox, which describes how organisations may fall due to overconfidence and hubris. We build upon previous research on paradoxes in business history and introduce the notion of an inverted Icarus paradox. Using rich archival sources coded in a relational database, we show how an entrant firm, Comvik, outmanoeuvred an established government monopoly in the non-market domain from 1980 to 1990, despite inferior resources and a weak market position. The government monopoly Televerket faced an inverted Icarus paradox; it could not leverage its strengths and political connections as they were stuck in a David versus Goliath narrative where public opinion was more sympathetic to the entrant firm Comvik.

Ratio Working Paper No 363: City Size, Employer Concentration, and Wage Income Inequality

Korpi, M., & Halvarsson, D.

Publication year

2023

Published in

Rati Working Paper Series.

Abstract

In this paper, we build upon a monopsony framework, suggested by Card et. al. 2016, which links firm level productivity and rent-sharing to wage inequality. Specifically, our research questions address i) to which extent labor market concentration across firms (within different types of locally situated industries) affects variation in wages among workers within these firms and industries, and ii) how this variation in turn spills over into economy-wide inequality (measured at the level of local labor markets). Using linked employer-employee full population data for Sweden, and an AKM modelling framework to separate between worker- and firm-level heterogeneity, our results suggest that higher firm-level fixed effects (a measure of rent-sharing) is associated with lower labor market employer concentration, something which affects average wage income among firms accordingly. Addressing wage income inequality by applying our model to different segments of the local labor market income distribution, we find that reduced average employer concentration in larger cities accounts for almost all variation in the (positive) link between city size-and wage inequality, except for the largest metropolises where it captures around 30-50 percent of variation depending on the income segment that we focus on.