"This paper studies the duration pattern of fixed-term contracts and the determinants of their conversion into permanent ones in Spain, where the share of fixed-term employment is the highest in Europe. We estimate a duration model for temporary employment, with competing risks of terminating into permanent employment versus alternative states, and flexible duration dependence. We find that conversion rates are generally below 10%. Our estimated conversion rates roughly increase with tenure, with a pronounced spike at the legal limit, when there is no legal way to retain the worker on a temporary contract. We argue that estimated differences in conversion rates across categories of workers can stem from differences in worker outside options and thus the power to credibly threat to quit temporary jobs."

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