Trump's "business dealings": Sucker people to invest into his projects promising double their investments using his fame. In the contract for these projects, Trump includes a big cut for himself. Builds the building, building isn't profitable as expected. Files bankruptcy, sells project, and makes way with the original cut he got from the contract. Repeat.
Hitler suspended the gold standard, embarked on huge public-works programs like autobahns, protected industry from foreign competition, expanded credit, instituted jobs programs, bullied the private sector on prices and production decisions, vastly expanded the military, enforced capital controls, instituted family planning, penalized smoking, brought about national healthcare and unemployment insurance, imposed education standards, and eventually ran huge deficits. The Nazi interventionist program was essential to the regime's rejection of the market economy and its embrace of socialism in one country.
