A model of employer advertised vacancies for labor is presented. The model's predictions are consistent with a variety of results reported by applied studies of the durations of different types of vacancies, and with the advertising strategies used by employers. The optimal advertising policy is...

Classical spatial autoregressive models share the same weakness as the classical linear regression models, namely it is not possible to estimate non-linear relationships between the dependent and independent variables. In the case of classical linear regression a semi-parametric approach can be...