Since OP didn't provide any, I looked up some sources for the "man acts" economic axiom. I found https://en.wikipedia.org/wiki/Praxeology https://en.wikipedia.o

Since OP didn't provide any, I looked up some sources for the "man acts" economic axiom. I found https://en.wikipedia.org/wiki/Praxeology https://en.wikipedia.org/wiki/Praxeology, which is used by the so called Austrian Economic school. Actually the axiom is "man acts purposefully". There is also quite some criticism on it, which can be found on the wiki page as well.