<prompt> Bheka isigaba esingezansi bese uphendula umbuzo emva kwalokho ngolimi olufanayo nesigaba: I-Passage: Imodeli ibheka ukuzwela kwempahla ebungozini obungaguquguquki owaziwa nangokuthi ingozi ehlelekile noma ingozi yemakethe, evame ukumelwa inani le-beta β embonini yezezimali, kanye nenzuzo elindelwe yemakethe nenzuzo elindelwe yempahla engekho engcupheni. I-CAPM ithatha uhlobo oluthile lwemisebenzi yokusetshenziswa lapho kuphela umzuzu wokuqala nowesibili obalulekile, okungukuthi ingozi ilinganiswa ngokuhlukahluka, isibonelo isisetshenziswa se-quadratic noma okunye ukubuyisa kwempahla okuthi ukusatshalaliswa kwamathuba kuchazwe ngokuphelele ngamaphuzu amabili okuqala ngokwesibonelo, ukusatshalaliswa okujwayelekile nezindleko zokuthengiselana zero ezidingekayo ukwehluka ukuze kususwe yonke ingozi ye-idiosyncratic. Ngaphansi kwalezi zimo, i-CAPM ikhombisa ukuthi izindleko zemali eyisisekelo zinqunywa kuphela yi-beta. Naphezu kokwehluleka ukuhlolwa okuningi kokuhlangenwe nakho, kanye nokuba khona kwezindlela zesimanje kakhulu zokulinganisa intengo yezimpahla nokukhethwa kwephothifoliyo njengombono wokulinganisa intengo ye-arbitrage kanye nenkinga yephothifoliyo kaMerton, i-CAPM isahlala ithandwa ngenxa yobulula bayo nokusebenziseka kwayo ezimweni ezahlukahlukene. Umbuzo: Iyiphi inzwa yezimpahla imodeli eyibhekayo?  <response>: ingozi engahlukaniseki 