Less obvious than breaking up the big banks but nearly as abhorrent to the financial industry is the idea of forcing them to back up their business with more equity and less debt.
Steeper capital requirements are one of the ideas floated by Neel Kashkari, president of the Federal Reserve Bank of Minneapolis, as part of a yearlong push to end the "too-big-to-fail" phenomenon.
Kashkari's sweeping initiative has set bankers' hair afire across the country and prompted a wave of criticism. Just last week, former Treasury Secretary Larry Summers called the whole thing "blatantly political." But the Minneapolis Fed is moving forward, with former Fed Chairman Ben Bernanke slated to visit Minneapolis for a second forum on the topic May 16.
A question that came up at Monday's inaugural forum and will come up all year is whether large banks have enough equity capital to be safe, and whether forcing them to issue more equity rather than debt is a useful way to prevent another finance industry collapse and spare taxpayers another bailout.
Banks don't just collect deposits and lend the money to other customers. They borrow money to lend it out — a lot more than they used to. American banks in the 1800s often held capital equal to 50 percent of assets, meaning they could absorb huge losses without becoming insolvent and needing a bailout.
Equity capital at banks — the shareholders' investment — shrank over the years and by the time the financial crisis arrived in 2007, the 10 largest banks in the country had equity capital equal to only 2.8 percent of their assets, according to Thomas Hoenig, vice chairman of the Federal Deposit Insurance Corp.
Lacking a cushion of equity when the drop in home prices triggered the financial crisis, several of the nation's largest financial institutions either collapsed or had to be bailed out.
Since then, bank capital positions have improved. The Dodd-Frank financial reform law encouraged higher capital ratios. The Basel Accords on international banking also imposed new, complex capital standards on banks. These reforms are having an effect, as bank capital has doubled or tripled in the past few years.