nonknowledgeintensive services corresponds to electricity gas and water supply construction trade hotels and restaurants skill intensity is based on the distribution of average wages across firms where low skilled refers to the first quartile medium skilled to the second quartile moderatelyhigh skilled to the third quartile and high skilled to the fourth quartile standard deviations are first averaged within each group and country and subsequently averaged across the following countries belgium the czech republic finland france germany italy the netherlands spain sweden and the united kingdom using weights by firm size category and industry within each country does not qualitatively change the results