More complex than that. In order to break up a company you have to show a market dominance and that breaking up will increase competition and IMO key would be leaving them in place would/could result in catastrophic results if they were to fail.
Looking back at the Trillion $ bail out started by Bush and jumped on by Obama who took it to $10 T LARGE we can now look back and see the results…by ANY standard and measure EPIC FAIL by the Govt.
Had the Govt taken the initial $1 T and simply spread it around to the taxpayers we would have lifted the country out of the recession IMO. Instead we spent $11T and never got anything but bigger companies and made a HELLVA lot of people on Wall Street UBER RICH. In fact the only people that benefited was the uber rich.
Some things are big, but big may not mean bad. Lets take oil companies. Deep offshore rig in the N Sea runs into the $100’s of Millions and you have not even pumped a bbl of oil at that time. Airlines at the global level have to be big. Bottom line is when you ticket to ride costs in the $100’s of millions and into the Billions then you need to wear big boy pants. Then it comes down to competition. If you are the only company playing offshore rigs or the only company flying planes outside the US then its time for a HARD LOOK. Are you keeping other companies out of the game??? If so the time to break you up.
Also there is the VERTICAL company. I own a BIG ranch, I own cows, I own a slaughter house, I own a meat trucking company and I own a chain of grocery stores and as a result I OWN the beef market and control the price of beef…WRONG! You can be a rancher and SELL those cows but not to yourself and up the chain.