A watan Satumba, Cibiyar Bincike ta Arewa maso Yamma ta Pacific ta fitar da rahotonta "Kirga Green in Green: Menene Bishiyar Birane?". An kammala bincike a Sacramento, CA da Portland, OR.
Geoffrey Donovan, mai binciken gandun daji tare da Cibiyar Bincike ta PNW, ya ƙaddara cewa itatuwan da aka dasa a kudanci da yammacin gidajen Sacramento sun rage kudaden wutar lantarki na lokacin rani da matsakaicin $25.16. A wani bincike na biyu da aka yi a Portland, tawagar Donovan ta gano cewa itatuwan titi da ke girma a gaban ko kusa da gida sun kara dalar Amurka $8,870 akan farashinsa na siyarwa tare da rage lokacinsa a kasuwa da kusan kwanaki 2. Waɗannan fa'idodin tattalin arziƙin sun fantsama zuwa ga kaddarorin makwabta: bishiyar unguwar da ke girma tare da daidaikun jama'a ta ƙara matsakaicin $12,828 zuwa ga haɗin ƙimar duk gidajen da ke tsakanin ƙafa 100.
Kuna iya karanta cikakken binciken nan.