If you had to pick a single government move that did more than any other to muck things up, it was probably this bill, passed by a Republican Congress and signed into law by lame-duck President Bill Clinton in December 2000. It effectively banned regulators from sticking their noses into over-the-counter derivatives like credit default swaps. There's no guarantee that regulators would have sniffed out the dangers in time. But banning them from even looking sent a pretty clear anything-goes message to OTC derivatives markets.
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