<prompt> Ngo-1940, uFriedman wamukela isikhundla eNyuvesi yaseWisconsinMadison, kodwa washiya ngenxa yokungavumelani nabafundisi mayelana nokuzibandakanya kwe-United States eMpini Yezwe II. UFriedman wayekholelwa ukuthi i-United States kufanele ingene empini. Ngo-1943, uFriedman wajoyina i-Division of War Research eColumbia University ephethwe nguW. Allen Wallis noHarold Hotelling, lapho echitha khona iMpi Yezwe II esebenza njengesazi sezibalo zezibalo, egxila ezinkingeni zokuklanywa kwezikhali, amaqhinga ezempi, kanye nokuhlolwa kwe-metallurgical. Ngo-1945, uFriedman wafaka imali engenayo evela ku-Independent Professional Practice eyibhalwe ngokubambisana noKuznets futhi yaqedwa phakathi no-1940 eColumbia njengombhalo wakhe wokuphikisana. Inyuvesi yamnika i-PhD ngo-1946.  <response>: Ngo-1945 