“…This approach is due to data availability. Kalb et al (2012) present a common standard of quite similar variables chosen as output proxies for municipalities (see, for example, de Borger and Kerstens, 1996;de Borger et al, 1994;Geys and Moesen, 2009;Kalb, 2014;Kalb et al, 2012;Stevens, 2005;Vanden Eeckhaut et al, 1993;Worthington, 2000).…”