1. Stop bankers from making huge, risky bets with other peoples' money. At the least, require they back their bets with a large percentage of their own capital, and bar them from raising money off their balance sheets through derivative trades. Also require they take their pay in stock options or warrants that can't be cashed in for at least three years, so they'll take a longer-term view. Best of all would be a requirement that investment banks return to being partnerships and the capital on their books be their own, not yours or your pension fund's. When investment banks were partnerships, every partner took an active interest in what every other partner and trader was doing. The real mischief started once they started selling shares to the public.

2. Prevent any bank from becoming too big to fail. Separate commercial from investment banking, as they were before the late 1990s. Commercial banks should return to their basic function of linking savers with borrowers. Investment bankers should return to their casino function of placing bets in the stock market and advising you and others about where to place your own own bets. Combining the basic utility with the casino only made bankers far richer and subjected you and me to risks we didn't bargain for. If separating commercial from investment banking isn't enough to bring all banks down to reasonable size, use antitrust laws to break them up.