A year after the financial system nearly collapsed, the nation's biggest banks are bigger and regaining their appetite for risk.
Goldman Sachs, JPMorgan Chase and others , which have received tens of billions of dollars in federal aid , are once more betting big on bonds, commodities and exotic financial products, trading that nearly stopped during the financial crisis.
That Wall Street is making money again in essentially the same ways that thrust the banking system into chaos last fall is reason for concern on several levels, financial analysts and government officials say.
