Bulte, C. van den

model diffusion q /p ratio buyer vendor effect income contagion supplier product marketing research culture heterogeneity ratio bass model study result distribution country curve g /sg model standard value consumer network journal preference diffusion curve number knowledge access income distribution parameter coefficient innovation income inequality data series vendor –supplier ties adoption consumer durables market shape interpretation contagion interpretation interaction theory series level variable price q / ^ system power distance evidence process s-shaped diffusion curves status transfer inequality income heterogeneity threshold gamma uncertainty estimate conjecture dimension science extent power population tendency table respondent university gini coefficient –vendor support conjoint change