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Inequality aversion and risk‐aversion are widely assumed in economic models; however existing economic literature fails to distinguish between the two. This paper presents methodology and a laboratory experiment, which separates inequality aversion from risk aversion. In a set of laboratory experiments, subjects had to choose between two risky alternatives which pay meaningful prizes with the same individual risk but different levels of egalitarianism. Thus, the choice of the more egalitarian alternative implies a higher level of inequality aversion. The experiment was conducted among children, some of whom live on a communal system (kibbutz) and some in the city.

Many firms use subjective performance appraisal systems due to lack of objective performance measures. In these cases, supervisors usually have to rate the performance of their subordinates. Using such systems, it is a well established fact that many supervisors tend to assess the employees too good (leniency bias) and that the appraisals hardly vary across employees of a certain supervisor (centrality bias). We explain these two biases in a model with a supervisor, who has preferences for the utility of her inequality averse subordinates, and discuss determinants of the size of the biases. Extensions of the basic model include the role of supervisor's favoritism of one particular agent and the endogenous effort choice of agents. Whether inequality averse agents exert higher efforts then purely self-oriented ones, depends on the size of effort costs and inequality aversion. -- Appraisals ; inequality aversion ; performance evaluation ; centrality bias ; leniency bias

This paper examines how to satisfy a separability condition related to "independence of the utilities of the dead" (Blackorby et al., 1995; Bommier and Zuber, 2008) in the class of "expected equally distributed equivalent" social orderings (Fleurbaey, 2010). It also inquires into the possibility to keep some aversion to inequality in this context. It is shown that the social welfare function must either be utilitarian or take a special multiplicative form. The multiplicative form is compatible with any degree of inequality aversion, but only under some constraints on the range of individual utilities.

We present simple one-shot distribution experiments comparing the relative importance of efficiency concerns, maximin preferences, and inequality aversion, as well as the relative performance of the fairness theories by Gary E Bolton and Axel Ockenfels and by Ernst Fehr and Klaus M. Schmidt. While the Fehr-Schmidt theory performs better in a direct comparison, this appears to be due to being in line with maximin preferences. More importantly, we find that a combination of efficiency concerns, maximin preferences, and selfishness can rationalize most of the data while the Bolton-Ockenfels and Fehr-Schmidt theories are unable to explain important patterns.