How did the axis powers last so long in WW2

A problem with a lot of this is that it would have conflicted with the state capitalism part of Fascist ideology. Both German and Italian policies during the war often worked against military advantage if it would potentially interfere with the profits of German or Italian corporations. No equivalent of Lend-Lease, for example - if an ally wanted German tanks or aircraft they paid hard cash in advance and even then were usually given clapped-out combat survivors rather than new equipment, if they were lucky enough to be allowed to buy at all. If that meant the allied armies couldn’t fight well in combat, well, the Master Race didn’t *really *need them, anyway.

And forget about licensed production - the Nazi plan was that all post-war industrial production in Europe would be in Germany, and the occupied territories and remaining countries would only serve as resource sources for the massive German economy. They had no desire to encourage independent production by their (temporary) allies that would interfere with this goal. German superiority leading to an inevitable ultimate victory seemed to be an unquestioned assumption in much of their planning.