They used to be, after glass stegall in the 1930s.
this was a problem we learned during the 1920s
That has since been...... relaxed gradually, and almost completely done away with under Clinton in the 1990s. And then <10 years later we got the 2007/2008 crisis. But, the original separation of investment and banking didn't get re-instated during the dodd frank stuff that came after the last crisis.
