Assuming a Nazi victory in WWII, the Reich has many more resources than the USSR did after WWII. It inherits the infrastructure of Western Europe relatively intact, and German infrastructure has not suffered like OTL. The infrastructure of the Reich allies: Hungary, Italy, Romania, Bulgaria is intact. Germany has Czech, and other industry as part of the Großdeutsches Reich (depending on how much of Norway/Denamrk/Holland/Belgium they actually annex). It now has a good deal of resources available in the conquered areas of the USSR, including the oil resources. Sure a lot of construction/repair will be needed in Ostland, but slave labor can clear rubble, grade roads, etc. In the coming years the oil/gas finds in North Africa will come on line owned by Italy and Vichy France, both part of the German orbit. Outside of the wartime allies and occupied territories you have Spain in the fascist orbit. Finland and Sweden have no choice but to be on good terms with the Reich (even if they don't deport their Jews), likewise Switzerland. Turkey now finds it self faced by Italy/Germany and allies in the Balkans/Greece, and most of the Med except Malta and Cyprus, Egypt and Palestine/Transjordan, and Syria is still part of Vichy, so it has to be friendly to Germany.
Leaving Asia aside, as the state of that is not covered (was there US-Japan war, etc), some countries in South America such as Argentina will be tilted towards the Nazis as OTL.
Given that the Nazis will come out of the war way ahead of where the USSR did in terms of viable industry and infrastructure, and their allies/economic circle will be much better off than much of what the USSR inherited - basically Eastern Europe with the exception of Poland will be untouched and of course Central and Western Europe either actual German territory or part of their economy, they exceed the economic power of the USSR by several times over even at the USSR's top. Even if they go to pieces at the same rate as the USSR they have a lot further to fall so they last longer. Also, the National Socialist ideology was not the reason for German economic issues in WWII, it was the byzantine empire building that Hitler encouraged. In the USSR, Marxist-Leninist ideology drove a lot of economic issues which means less economic flexibility. Finally, as disgusting as the Nazi plans for slavery were, other than the most unpleasant or dangerous tasks slaves were never supposed to be a major factor in industry. IMHO once a lot of slaves have been exterminated through labor cleaning up the mess in the east and doing grunt work in building/reconstruction, there will be a relatively small slave population in personal service for the well off, agricultural work in the east, garbage collection, dangerous/unhealthful resource extraction etc.
A victorious Germany will be a Hellhole for those not racially in the top tier, however this does not mean they will be totally economically incompetent especially in a peacetime and post Hitler environment.