The following questions are answered on the basis of continuous data collection in established consumer samples:
The following studies are available:
The participants can be recruited from existing customer addresses or from the existing GfK consumer panels (with no additional recruitment costs). Comparisons of methods show that the written survey method increases respondents’ willingness to participate. In addition, the accuracy of the results is improved since the respondents can decide for themselves on when they want to supply information and can refer to documents and bills.
Quarterly, semi-annually, annually
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