<prompt> Bheka isigaba esingezansi bese uphendula umbuzo emva kwalokho ngolimi olufanayo nesigaba: Ukudlula: Ngo-1940, uFriedman wamukela isikhundla eNyuvesi yaseWisconsin eMadison, kodwa washiya ngenxa yokungavumelani nabafundisi mayelana nokubandakanyeka kwe-United States eMpini Yezwe II. UFriedman wayekholelwa ukuthi i - United States kufanele ingenele impi. Ngo-1943, uFriedman wajoyina i-Division of War Research e-Columbia University ephethwe nguW. Allen Wallis noHarold Hotelling, lapho asebenzisa khona iMpi Yezwe II esebenza njengesazi sezibalo sezibalo, egxile ezinkingeni zokuklanywa kwezikhali, amaqhinga ezempi, kanye nokuhlolwa kwe-metallurgical. Ngo-1945, uFriedman wafaka i-Incomes from Independent Professional Practice eyibhalwe ngokubambisana noKuznets futhi yaqedwa ngo-1940 eColumbia njengombhalo wakhe wobudokotela. Inyuvesi yamnika iziqu zobudokotela ngo-1946. UFriedman wachitha unyaka wezifundo ka-1945 kuya ku-1946 efundisa eNyuvesi yaseMinnesota lapho umngane wakhe uGeorge Stigler ayesebenza khona. NgoFebruary 12, 1945, indodana yakhe, uDavid D. Friedman yazalwa. Umbuzo: Indodana kaFriedman yazalwa ngamuphi unyaka?  <response>: Ngo-1945 