Mu Seputembala, Pacific Northwest Research Station idatulutsa lipoti lake "Kuwerengera Zobiriwira Zobiriwira: Kodi Mtengo wa Urban Worth ndi Chiyani?". Kafukufuku adamalizidwa ku Sacramento, CA ndi Portland, OR.
Geoffrey Donovan, katswiri wofufuza za kafukufuku ndi PNW Research Station, adatsimikiza kuti mitengo yobzalidwa kumwera ndi kumadzulo kwa nyumba za Sacramento inachepetsa ndalama za magetsi m'chilimwe ndi pafupifupi $25.16. Pakafukufuku wachiwiri ku Portland, gulu la Donovan linapeza kuti mitengo ya mumsewu yomwe ikukula kutsogolo kapena pafupi ndi nyumba inawonjezera pafupifupi $ 8,870 pamtengo wake wogulitsa ndikuchepetsa nthawi yake pamsika pafupifupi masiku a 2. Zopindulitsa zachuma izi zidafalikira kuzinthu zoyandikana nazo: mtengo wapafupi womwe ukukula m'mphepete mwa njira ya anthu unawonjezera pafupifupi $ 12,828 ku mtengo wophatikizana wa nyumba zonse mkati mwa 100 mapazi.
Mukhoza kuwerenga phunziro lonse Pano.