The aim of this research was to study the influence of related variety on the economic performance of Spanish provinces during the international crisis (2009–2013) and the post‐crisis period (2014–2018), with the goal of contributing to assess the validity of the skill‐relatedness approach. The research is based on labor flows in a sample of more than one million affiliated workers. Our results confirmed the influence of related variety on the growth of GDP and employment in knowledge‐based industries, in protecting against unemployment, as well as on the creation of new firms, although with marked differences according to the economic cycle. Robustness issues and possible lines of progress using this novel methodology are also discussed. [ABSTRACT FROM AUTHOR]
Determination of optimal population densities underlies the economic rationality when planning the provision of basic public infrastructure by local governments. Using econometric techniques based on the translog cost function, we investigate the existence of economies of scale, associated to a larger urban size in terms of population and housing, determine the effect of alternative urban patterns - compact or dispersed - on the cost of provision, and calculate optimal population densities as targets for urban planning. We illustrate the practicality of our model using Spanish municipal data, and unveil latent economies of scale and suboptimal urban densities due to excessive dispersion. Based on these findings we propose specific policy guidelines in terms of desirable urban structures. [ABSTRACT FROM AUTHOR]