《工业组织》（英文版）innovation1

日 aB,T) 9 co educed BRaD 旧T2 R&D:pwd群s动ewv Q discswwunnt R&Do B(R&D]: cost reductions enefits]from spending on R&D T17 T=17 2 QB, 8 o旧B8 T=817 o17 BiRG Q R&D