Bloomberg Billionaires Index itangaza ko kugeza ubu muri uyu mwaka, abaherwe 500 ba mbere ku isi bamaze guhomba agera kuri miliyari 553 z'amadolari y'Amerika Abashoramari mu rwego rw'ibikomoka kuri peteroli ndetse no muri 'gas' barahombye cyane kubera ko ibiciro byaguye kubera igabanuka ry'ababicyeneye ku isi.
