Nazism=fascism=authoritarianism
this is the basic dichotomy.
and can be achieved by any economic system.
the key is authoritarianism.
so a country can have a socialist economy,and fall into fascism,because it is the political class that can drive it in that direction.
so too,can a capitalist economy,fall into fascism.
or do you think the hierarchical structure of a corporation is conducive to democratic participation? it is,by design,a tyranny.
the economic software is fairly irrelevant,it is authoritarianism that is a huge indicator.
Robert paxtons "the anatomy of fascism" is probably the best book to read.