全球農(nong)(nong)(nong)藥(yao)(yao)(yao)市(shi)(shi)(shi)(shi)場基(ji)本(ben)被(bei)研(yan)發(fa)(fa)型(xing)(xing)農(nong)(nong)(nong)藥(yao)(yao)(yao)公(gong)司(si)占(zhan)據，新(xin)農(nong)(nong)(nong)藥(yao)(yao)(yao)產品一(yi)般的專(zhuan)利(li)(li)保護期為16-20年甚至(zhi)更長(chang)。農(nong)(nong)(nong)藥(yao)(yao)(yao)研(yan)發(fa)(fa)型(xing)(xing)公(gong)司(si)可獨(du)占(zhan)市(shi)(shi)(shi)(shi)場10年甚至(zhi)更長(chang)時(shi)間，形成"新(xin)農(nong)(nong)(nong)藥(yao)(yao)(yao)獨(du)占(zhan)市(shi)(shi)(shi)(shi)場-豐厚利(li)(li)潤-巨(ju)額研(yan)發(fa)(fa)投入-新(xin)農(nong)(nong)(nong)藥(yao)(yao)(yao)獨(du)占(zhan)市(shi)(shi)(shi)(shi)場"的良性循環。農(nong)(nong)(nong)藥(yao)(yao)(yao)的開(kai)(kai)發(fa)(fa)具有(you)(you)高風險、高投入和周期長(chang)等特點，實力較弱的公(gong)司(si)無(wu)法(fa)承擔。因此，近年來世(shi)界(jie)農(nong)(nong)(nong)藥(yao)(yao)(yao)公(gong)司(si)之間進行了一(yi)系列(lie)資產重組，通過兼并與合并，使世(shi)界(jie)農(nong)(nong)(nong)藥(yao)(yao)(yao)生(sheng)(sheng)產更加集中，壟斷性更強，也更有(you)(you)實力進行新(xin)農(nong)(nong)(nong)藥(yao)(yao)(yao)的開(kai)(kai)發(fa)(fa)和生(sheng)(sheng)物工(gong)程的研(yan)究。1994年世(shi)界(jie)大型(xing)(xing)農(nong)(nong)(nong)藥(yao)(yao)(yao)公(gong)司(si)有(you)(you)10家(jia)，目前(qian)只剩(sheng)下6家(jia)。這六(liu)家(jia)均為研(yan)發(fa)(fa)型(xing)(xing)農(nong)(nong)(nong)藥(yao)(yao)(yao)公(gong)司(si)，其占(zhan)據全球農(nong)(nong)(nong)藥(yao)(yao)(yao)市(shi)(shi)(shi)(shi)場70%左右(you)的市(shi)(shi)(shi)(shi)場份額。