Search results for "J2"
showing 10 items of 137 documents
Some families of big and stable bundles on $K3$ surfaces and on their Hilbert schemes of points
2021
Here we investigate meaningful families of vector bundles on a very general polarized $K3$ surface $(X,H)$ and on the corresponding Hyper--Kaehler variety given by the Hilbert scheme of points $X^{[k]}:= {\rm Hilb}^k(X)$, for any integer $k \geqslant 2$. In particular, we prove results concerning bigness and stability of such bundles. First, we give conditions on integers $n$ such that the twist of the tangent bundle of $X$ by the line bundle $nH$ is big and stable on~$X$; we then prove a similar result for a natural twist of the tangent bundle of $X^{[k]}$. Next, we prove global generation, bigness and stability results for tautological bundles on $X^{[k]}$ arising either from line bundles…
Workplace Heterogeneity and the Returns to Versatility
2021
Abstract In the canonical random on-the-job search model with continuous firm heterogeneity, I show that a mean-preserving spread of the firm-productivity distribution raises the returns to mobility, i.e., the inter-firm mobility of workers as measured by the number of outside contacts per employment spell. Both sorting and rent-share mechanisms play a role. In a further contribution, I distinguish frictional and structural impediments to mobility in order to establish a link between mobility and skills via the concept of versatility. Versatility enhances a person’s mobility since a mismatch between job requirements and the person’s skill set is less likely to occur. I provide some statisti…
Back to School : Labor-Market Returns to Higher Vocational Schooling
2019
This paper examines the labor-market returns to a new form of postsecondary vocational education: vocational master's degrees. We use individual fixed effects models on a matched sample of students and non-students from Finland to capture any time-invariant differences across individuals. We find that attendance in vocational master's programs leads to an earnings increase of more than seven percent five years after entry. The estimated effect remains positive even if selection on unobservables is twice as strong as selection on observables. Earnings gains are similar by gender and age, but they are marginally higher for those in the health sector than for those in the business or technolog…
Who turns to entrepreneurship later in life? - Push and pull in Finnish rural and urban areas
2014
Age is an important factor in entrepreneurship. The paths into entrepreneurship at a later age may be varied. Self-employment in later life may be either a form of partial retirement or a career option. Older individuals may also be pushed into self-employment. The focus of this paper is on the career choices of older individuals and their background motivations in Finland. The purpose is to analyse the factors and motives in terms of the push and pull dichotomy that lead individuals to enter self-employment at older ages in different types of labour markets in Finland, viz., rural and urban areas. Although some studies have focused on transitions to self-employment among older workers, que…
The continuous sample of working lives: Improving its representativeness
2017
This paper studies the representativeness of the Continuous Sample of Working Lives (CSWL), a set of anonymized microdata containing information on individuals from Spanish Social Security records. We examine several CSWL waves (2005–2013) and show that it is not representative for the population with a pension income. We then develop a methodology to draw a large dataset from the CSWL that is much more representative of the retired population in terms of pension type, gender and age. This procedure also makes it possible for users to choose between goodness of fit and subsample size. In order to illustrate the practical significance of our methodology, the paper also contains an applicatio…
Satisfacción laboral de los asalariados en España
2012
El objetivo de este trabajo es identificar los factores determinantes del nivel de satisfacción laboral de los asalariados en España, haciendo especial hincapié en las diferencias de género y de nacionalidad. Para ello, se estima un modelo de respuesta múltiple ordenada, utilizando los datos de la Encuesta de Calidad de Vida en el Trabajo, para el período que abarca desde 2006 a 2010. Los resultados obtenidos muestran que, después de controlar por las características personales y laborales de los asalariados, se obtiene un diferencial positivo en la satisfacción laboral en favor de las mujeres, mientras que no se evidencia la existencia de un efecto diferencial entre los asalariados nativos…
ESCOLARIZACIÓN, TRABAJO INFANTIL Y SATISFACCIÓN LABORAL: EVIDENCIA PARA ETIOPÍA
2012
En ligne sur http://www.staragon.com/revecap/revista/numeros/58/pdf/gamero_lassibille.pdf; International audience; Tomando como referencia Etiopía, este artículo investiga, en el marco de un modelo probit bivariante, cuáles son los factores que influyen en las probabilidades de que un niño trabaje o siga escolarizado. Los resultados muestran que el trabajo infantil desplaza efectivamente a la demanda de educación y sugieren que prohibir el trabajo infantil, para romper la competencia que se ejerce entre la educación y el empleo, podría perpetuar el nivel de pobreza de las generaciones futuras. Por otro lado, se analizan los factores de los que depende su satisfacción laboral, poniendo espec…
Labor market participation, employability and and basic skills: the French case
2013
En ligne sur http://cemapre.iseg.utl.pt/educonf/2e3/files/submissions_to_web/Branche-Seigeot%20Aline.doc; The development of Information and Communication Technologies (ICT) and the important technological but also organizational innovations during the last decades have transformed the labor market and the jobs nature. One major consequence of this on employment has been the gradual rise in qualifications' structure sought and demanded by employers. However, the expansion of higher education contributed to depreciate diplomas proportionately more widespread in the labor market due to a greater skills' heterogeneity of their owners. Since high basic skills levels protect against unemployment…
Job Satisfaction among Primary School Personnel
2016
International audience; This article analyzes the job satisfaction of primary school teachers inMadagascar. Based on the estimation of multilevel models, low wages and problems getting paid, job insecurity, lack of in-service training, high pupil-teacher ratios, and lack of basic infrastructure and teaching materials are identified as the main reasons for dissatisfaction. Principals' control of teachers' activities also adversely affects satisfaction, suggesting that, in Malagasy schools, neither school directors nor teachers have succeeded in adopting organizational cultures based on cooperation among their members. These results are likely to stimulate debates on educational policy, both …
The paradoxical management of service skills
2015
This paper focuses on service skills which are mobilized by front office agents when they are involved with customers. These skills are most of the time tacit. We consider that the way in which firms recognize these skills and contribute to their development is an important management issue. It is all the more important that a lot of jobs combine poor levels of qualification and highly situated skills.