“…If we set up a model without an option for households to save, we arrive at qualitatively similar results to those described in the following. 4 We rely on the assumption of a dynamically efficient economy (Aaron, 1966), which has been discussed on theoretical and empirical grounds by Abel et al (1989), Homburg (1991), or Koethenbuerger and Poutvaara (2006), among others, and is generally considered the more appealing assumption for models on the political economy of social security systems (see Galasso and Profeta, 2002, p. 7). 5 In the literature on social comparison, one often finds disutility terms by comparing an individual's payoff with the payoff of a reference group either in terms of a difference (see, e.g., Ljungqvist and Uhlig, 2000;Choudhary and Levine, 2006;Pérez-Asenjo, 2011) or in ratio form (see, e.g., Persson, 1995;Corneo, 2002;Goerke and Hillesheim, 2013).…”