Hippel, E. von

innovation consumer product producer process hippel innovator survey sample development software respondent model study research management transfer fication signi user innovation table variable equipment fi rms expenditure education design von hippel consumer innovation policy user innovations market information consumer products innovating investment source household company example signi ficant process equipment innovating consumers property number industry business ficant sector statistic consumer innovators service machine value user-innovator question estimate kingdom class uk business share science household sector innovation review supplier fi ndings property rights activity expense consumer-innovator production compensation consumer innovator attainment flower group signi ficance employee quali fications modi fication