The more they charge each other, the higher the perceived risks to short term capital, like in late 2008 when Lehman etc...;
"Lehman Brothers Holdings Inc. was a global financial services firm.
...On September 15, 2008, the firm filed for Chapter 11 bankruptcy protection following the massive exodus of most of its clients, drastic losses in its stock, and devaluation of assets by credit rating agencies, largely sparked by Lehman's involvement in the subprime mortgage crisis and subsequent allegations of negligence and malfeasance."
No one went to jail
There are only laws for the little people
Most of the Wall Street execs who created the financial crisis
are either still employed in top paying jobs
or retired with most or more of the wealth they sucked out of multiple frauds
condoned by the Federal Reserve and the SEC
which benefited those in power, including Warren Buffett
owner of Greensboro's News and Record
which hasn't reported Billy Jones' lawsuit against the City
for more than a month