We present some properties concerning heterogeneity using as illustrations duration data models. We first study the links between aggregate and disaggregate concepts. This allows to give some precise definitions of the heterogeneity biases and of the mover stayer phenomenon. We also introduce...

In this paper, we examine the disincentive effects of the state of employment service on the search effort of unemployed workers and on their exit rate from unemployment. For that purpose, we specify and estimate two structural search models in which unemployed workers select their optimal...

In this paper, we examine the disincentive effects of the public employment serviceon the search effort of unemployed workers and on their exit rate from unemployment.For that purpose, we specify a structural search model with fixed and variablecosts of search in which unemployed workers select...

In this paper, we examine the disincentive effects of the public employment service on the search effort of unemployed workers and on their exit rate from unemployment. For that purpose, we specify a structural search model with fixed and variable costs of search in which unemployed workers...

In this paper, we examine the disincentive effects of the public employment service on the search effort of unemployed workers and on their exit rate from unemployment. For that purpose, we specify a structural search model with fixed and variable costs of search in which unemployed workers...