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Over the last two years of the housing bubble, Wall Street bankers perpetrated one of the greatest episodes of self-dealing in financial history.

Faced with increasing difficulty in selling the mortgage-backed securities that had been among their most lucrative products, the banks hit on a solution that preserved their quarterly earnings and huge bonuses:

They created fake demand.

A ProPublica analysis shows for the first time the extent to which banks — primarily Merrill Lynch, but also Citigroup, UBS and others — bought their own products and cranked up an assembly line that otherwise should have flagged.