00670cam a2200205 7i4500 0000030039 20230202090000.0 0875848893 HF5415.124 HAG 1999 Hagel, John author Net Worth : shaping markets when customers make the rules John Hagel and Marc Singer. Boston, MA: Havard Business School Press, 1999. xx, 311 pages: illustrations; 24 cm. text rdacontent unmediated rdamedia volume rdacarrier Infomediaries Consumers -- Information services Commerce Electronic Singer, Marc