consumption identity consumer society business consumer consumer sociology kay koschel konsum emotion tiefenpsychologie; consumer research; susanne hols konsumentenverhalten market research consumers’ decision-making process qualitative methods btob consumer sociology; advanced qualitative methods trend research consumer depth psychology marktforschung motivforschung konsumforschung qualitative research luxus marketing business konsumsoziologie identität konsumgesellschaft b2b communication brand
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