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:…from government and industry publications suggest that ongoing price reductions were not fully anticipated, even by industry insiders.26 Finally, Gillingham and Tsvetanov (2017) provide support for their assumption of static demand using data on purchases and a consumer survey in the…
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