Ogawa, S.

consumer innovation product company design von hippel market consumer-innovator producer consumer products survey management sample size paradigm japan sloan hippel process example innovation paradigm sample review consumer innovation phase country research article citizen user innovation paradigm shift expenditure service vat i development eric von hippel novel consumer innovations percentage innovating product innovation innovating users innovation process business susumu ogawa sloanreview.mit.edu effort function interest support ogawa number amount innovator implication other information property rights demand product development systems prototype question household sector innovation software study extent consumer product development product development right users — source paper model finding property science customer today community respondent skateboard