Start with the career politicians at the Federal level and their relationships with the U.S. banking industry, Wall Street and the Federal Reserve.
Trump has worked within these same circles, but as a civilian with very limited influence. Trillions at stake.
Then there's the relationship between the industries above and their equals across the globe. Notice how the U.S. housing crash and banking crash causes ripples around the world. Trillions at stake
Then there's trade agreements. Every countries economy is now so intertwined that any big move will have far reaching effects. Trump is campaigning on putting America first and the rest of the global market second. This is not how the rest of the world wants us to play the game. Trillions at stake.
Then there's the subsidies the Feds pay out to the eco-scammers while attempting to bankrupt fossil fuels. Billions at stake.
Then there's our crappy neighbor to the South. Trump will cut them off. Billions at stake.
Then there's military spending in/on other countries. Billions at stake.
Then there's our relationship with OPEC. Keeps us from drilling here. Trump will want to change that arrangement. Trillions at stake.
Then there's all the Musloid deals Obama has made over the past 8 years. These people will not be happy when their unconstitutional executive agreements are made null and void. Billions at stake.
I'm not suggesting a President can pull off or shut down everything they would like to, but going against any one of the above oligarch arrangements is enough to put a yuge price on one's head.
Trump has stated over and over that he does not intend to play along. This is why the GOPe wanted to stop him. They are going to lose at least some of their money. It is also why most world leaders don't want him. They have longstanding lucrative arrangements with our Federal government.
It will be interesting to watch anyway.