Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:In Section 2, we present an experiment by Abeler et al. (2010) that analyzes the relative importance of two conflicting fairness principles—wage equality and horizontal equity. In particular, Abeler et al. study whether equal wages are considered fair and look at potentially detrimental consequences of equal wages on performance. In Section 3, we turn to a second question that becomes important when principals interact with more than one agent, namely, whether the principal can observe agents’ individual performance or only the outcomes of the group of agents as a whole. We present a recent study by Kleine and Kube (2010) that addresses the question whether reporting (subjective) performance measures can enhance the efficiency of interaction in work groups. Next, we discuss a study by Schneider and Kube (2006) that analyzes how differences in social proximity affect gift exchange in multi-worker firms.
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