Here are a few ideas… being championed by Edward Kane, an economist at Boston College who has studied financial regulation for more than 40 years. Bonuses to senior bankers and managers should be paid in a special class of stock that would require the holders to chip in their own personal capital if the firm becomes insolvent. A secondary market in these special shares likely would spring up to provide diversification to the holders; they would have to offer a discount to entice buyers, and the market price would give investors and regulators another way to monitor risk.