Iterambere ryihuse mu bukungu mu mahanga ryatumye hakenerwa cyane ibyuma, kandi politiki y’ifaranga yo kuzamura ibiciro by’isoko ry’ibyuma yazamutse cyane.

Bamwe mu bitabiriye isoko bagaragaje ko ibiciro byibyuma byazamutse buhoro buhoro kubera isoko ry’ibyuma byo hanze bikenewe cyane mu gihembwe cya mbere; Kubera iyo mpamvu, ibicuruzwa byoherezwa mu mahanga hamwe n’ibicuruzwa byoherezwa mu mahanga byiyongereye cyane bitewe n’ubushake bw’imbere mu gihugu bwohereza ibicuruzwa hanze.

Ibiciro by'ibyuma byazamutse cyane mu Burayi no muri Amerika, mu gihe izamuka ryabaye rito muri Aziya.

Amasoko y'ibyuma by'i Burayi na Amerika yakomeje kwiyongera kuva igice cya kabiri cy'umwaka ushize. Niba hari impinduka mubukungu, amasoko yo mu tundi turere azagira ingaruka.