Ukuvinjelwa kwezokuthutha nokuhweba isilinganiso, esivame ukwenziwa ohulumeni, izinhlangano zamazwe ngamazwe noma abathwali, esikhawulela noma esinqabela ukuhanjiswa nokushintshisana kwezimpahla, amasevisi, noma uhlobo lwemali luye ezindaweni ezithile noma ngemizila ethile. Izivimbelo zifeza izinjongo ezihlukahlukene, ezihlanganisa ukusabela ezenzakalweni zezombusazwe, ukuqinisekisa ukuphepha, noma ukufaka ingcindezi yezomnotho.
Nakuba ezinye izivimbelo zibanzi futhi zifaka konke ukuhweba, ezinye ziyakhetha, ziqondise imikhakha ethile efana nezikhali zokuvikela noma izinsiza ze-petroleum. Le mikhawulo, evela ezicini ezihlukahlukene ezifana nobudlelwano bezokusebenzela, izimo zezomnotho, noma ukucatshangelwa kobuchwepheshe, ihlose ukufaka umthelela kuzinqubomgomo noma ukuziphatha kwesifunda esithile noma ibhizinisi elihilelekile.