[A]lthough there is substantial heterogeneity across underwriters, a significant degree of misrepresentation exists across all underwriters, which includes the most reputable financial institutions.
BUBBLES are conducive to fraud. Buyers become less careful about doing their due diligence when asset prices are soaring and financing for speculation is plentiful. Unscrupulous sellers exploit this incaution. The victims are none the wiser as long as the bubble continues to inflate.
During America's housing bubble, mortgage originators were told to do whatever it took to get loans approved, even if that meant deliberately altering data about borrower income and net worth. Many argue that the banks that bundled those loans into securities deliberately and systematically misled investors and private insurers about the risks involved. It is easy to be unsympathetic in the absence of hard evidence. As I argued in a previous post , 'investors were not forced to take the losing side of so many trades.'