Friedman kuma an san shi ne saboda aikinsa game da aikin amfani, da ra'ayin samun kudin shiga na dindindin (1957), wanda Friedman da kansa ya kira shi a matsayin mafi kyawun aikin kimiyya. Wannan aikin ya yi jayayya cewa masu amfani da hankali za su kashe adadin abin da suka fahimta a matsayin kudaden shiga na dindindin. Za a sami ceto mai yawa. Rage haraji kamar haka, kamar yadda masu amfani da hankali za su yi hasashen cewa haraji za su karu daga baya don daidaita kudaden jama'a. Sauran muhimman gudummawa sun haɗa da sukar da ya yi game da Phillips curve da kuma manufar yawan rashin aikin yi na halitta (1968). Wannan zargi ya danganta sunansa, tare da na Edmund Phelps, tare da fahimtar cewa gwamnati da ke haifar da hauhawar farashin kayayyaki ba za ta iya rage rashin aikin yi ta hanyar yin hakan ba. Rashin aikin yi na iya zama na ɗan lokaci, idan hauhawar farashin kaya ba abin mamaki bane, amma a cikin dogon lokaci rashin aikin yi za a ƙaddara shi ta hanyar rashin daidaituwa da rashin daidaito na kasuwar. Tambaya: Wanene ya yi da'awar Friedman mafi kyawun aikin
Friedman