This thesis studies the role of new firms in the labour market and uses Swedish data to analyze labour mobility in new firms, including both transitions of workers into and from new firms. In particular, it focuses on employees’ wages in new firms and post-new firm employment labour market outcomes as transitions into long-term employment and entrepreneurship.  This thesis consists of four essays. The first two essays concern labour mobility into new firms. The last two essays focus on post-new firm employment mobility. The first essay explores the role of new firms as an entry point into the labour market for individuals with little (or no) labour market experience. The findings show that the wage penalty found in previous research, which includes more heterogeneous groups of employees, decreases once the focus is solely on labour market entrants.  The second essay investigates whether there is a wage penalty for being employed at a new firm if the individual employee’s experience and status in the labour market are taken into account; this essay focuses on individuals who decide to switch jobs. The findings show that there is a wage penalty for being employed at a new firm; however, considering a random selection into new firms may underestimate the wage differentials. The third essay studies the role that new firms play for the career path of their employees. In particular, this paper analyzes whether short-term employment in new firms (employment lasting less than one year) may serve as a stepping stone toward long-term employment (at least two years of employment with the same employer) for non-employed individuals. The findings indicate that short-term employment in new firms may serve as a stepping stone toward long-term employment. The fourth paper examines the new firm effect on entrepreneurship, which the findings indicate is positive and statistically significant; this effect remains even after controlling for a worker's ability and shows that employees with both high and low levels of ability may transition to entrepreneurship. / <p>QC 20160916</p>

A la lumière du rôle de premier plan joué par les entreprises jeunes dans la définition du processus de destruction créatrice et dans la création globale d’emplois, cette thèse fournit de nouvelles preuves de la dynamique de ce segment du système de production. La thèse s’articule autour des thèmes suivants : i) le rôle joué par les activités d’innovation dans la promotion de la croissance de l’emploi dans les jeunes entreprises ; ii) l’impact de la récession économique sur les taux de croissance des jeunes entreprises par rapport aux petites entreprises ; iii) le rôle joué par les politiques publiques dans le soutien aux entreprises innovantes. Le chapitre 1 examine le lien sous-étudié entre les activités d’innovation et la croissance de l’emploi dans les entreprises nouvellement créées. Basés sur un ensemble de données représentatif d’une cohorte d’entreprises américaines créées en 2004, les résultats soulignent la pertinence de la recherche et du développement et des brevets pour favoriser la croissance et, en particulier, la performance à forte croissance des entreprises nouvellement créées. Le chapitre 2 fournit des éléments de preuve supplémentaires sur la relation entre innovation et croissance en utilisant des données chiliennes et se concentre sur les différences de rendement de l’innovation pour les entreprises jeunes et matures. Les résultats montrent que l’innovation profite aux entreprises à forte croissance. Cependant, ces résultats se concrétisent en particulier pour les entreprises matures et dans le cas d’innovation de procédé, alors que les activités innovantes ne semblent pas être une condition préalable à la performance à forte croissance des jeunes entreprises. Ces résultats mettent en évidence le fait que les rendements de l’innovation pourraient être spécifiques au contexte. Le chapitre 3 porte sur l’impact de la récession à double creux sur la performance de croissance des jeunes entreprises par rapport aux petites entreprises. En utilisant des données pour dix pays de la zone euro, les résultats montrent que les petites entreprises n’ont pas été particulièrement touchées, voire plus performantes, alors que les jeunes entreprises ont enregistré une nette diminution de leur taux de croissance. Dans l’analyse, nous constatons également que le canal de la contrainte financière semble être l’une des forces responsables des résultats susmentionnés. / In light of the prominent role played by young firms in shaping the creative destruction process and contributing to overall job creation, this thesis provides novel evidence on the dynamics of these segment of the productive system. In particular, the dissertation revolves around the following topics: i) the role played by innovation activities in fostering employment growth in young firms; ii) the impact of the economic recession of the growth rates of young vs. small firms; iii) the role played by public policies in supporting innovative entrants. In more detail, Chapter 1 examines the under-researched nexus between innovation activities and employment growth in newly born firms. Based on a representative dataset for a cohort of US firms born in 2004, the results highlight the relevance of R&D and patenting to foster growth and, especially, high-growth performance for newly-born firms. Chapter 2 provides additional evidence on the relationship between innovation and growth by using Chilean data and focus on how returns to innovation differ for young and mature firms. Results show that innovation benefits high-growth firms. However, these results materialize especially for mature firms and in the case of process innovation whereas innovative activities do not appear to be a prerequisite for high-growth performance in young businesses. These findings highlight how the returns to innovation might be context specific. Chapter 3 focuses on the impact of the double-dip recession on the growth performance of young vis-à-vis small firms. Using data for ten Eurozone countries, the findings show that small firms were not particularly affected - if anything they performed better - whereas young firms experienced a marked decrease in their growth rates. In the analysis we also find that the financial constraint channel appears to be one of the forces responsible for the above results. In Chapter 4 the main focus is the investigation of the role of public policy in providing support for the performance of innovative new firms. In particular, we investigate the impact of a recent policy implemented in Italy (i.e. the “Start-up Act”). The analysis indicates an overall positive effect of the program on a wide range of firm-level outcomes.