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:However, discretionary policy can result in expectations traps and
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multiple equilibria, see Albanesi et al. (2003), King and Wolman (2004) and Blake and Kirsanova (2012), and a simple New Keynesian model is not appropriate to investigate many consequences of policy delegation.
Category: