Like Paul Krugman, I have long detested the right wing meme that government should be run "like a business." For many obvious reasons this is deeply stupid and Krugman does a better job of course on the economics of why a national economy is not like a business, and the difference is much more than just scale.
That said, let's imagine that we were going to treat the United States as a business. What would that mean for the Big Finance MOTUs?
If you've worked for a big company, you'll probably find that there is a class divide between those whose work brings direct revenue for the company (the "profit centre" people) and those whose work does not ("cost centre"). Profit centre people are usually sales people and other front line workers who interface directly with customers, but they're also the production staff that make whatever product is sold. Basically everyone working in the primary line of business for that company.
Everyone else works in a cost centre. That's where I've always worked. This is IT, HR, mailroom, legal, facilities and all the roles that don't directly contribute to incoming revenue, but either make it possible or otherwise reduce risk, cut costs and so forth. The profit centre people couldn't actually do what they do without some amount of these people to support them, but the class divide is often very stark with greater perks and higher status given to the profit centre employees.
Intuitively this makes some sense, though many companies take it too far and neglect the support trades which ultimately hampers the "productive" people too.
The funny thing is that in United States Inc, the Big Banks, traders, brokers and the like would all be cost centre employees. In their own companies now they clearly walk tall as the drivers of profit for their firms, but in the grander sense of the economy, they're a burden to be minimized. You need a certain amount of HR people to keep down misconduct and enforce policy but only so many and every extra one after that is money wasted. Whereas with the profit centre staff, hiring more can mean more revenue, more profit, more product.
In big companies, employees in the cost centres are very aware of that status, and work to demonstrate their worth to the enterprise by trying to track such metrics that they can, to prove they're contributing to the bottom line.
We should demand the same of Big Finance. Justify your existence. Not just by hand waving about connecting lenders and borrowers or buyers and sellers, a web site could do that. Prove the 15% the economy lavishes on you returns to us somehow.
Of course they couldn't, but that's the point of exercise. Finance has some role to play, and the ideal size of that role varies with circumstances, but when we hit a point where we can't figure out what benefit United States Inc's shareholders are seeing from hiring another big-bonus banker, it's time to clean up that "department."