Affiliation: | 1. Department of Economics, The Royal Institute of Technology (KTH) and CEPR, Brinellv?gen 1, SE‐100 44 Stockholm, Sweden. e‐mail:marcus.asplund@infra.kth.se;2. Swedish Institute for Social Research, SOFI, Stockholm University, SE‐106 91 Stockholm, Sweden. e‐mail:rickard.eriksson@sofi.su.se;3. Swedish Post and Telecommunications Agency, Box 5398, 10249 Stockholm, Sweden. e‐mail:niklas.strand@pts.se |