I believed that the collapse of the subprime mortgage market would ultimately lead to huge failures among the largest financial institutions. But at the time almost no one else thought these trades would work out in my favor.

Image Credit... Alex Nabaum

During 2007, under constant pressure from my investors, I liquidated most of our credit default swaps at a substantial profit. By early 2008, I feared the effects of government intervention and exited all our remaining credit default positions  by auctioning them to the many Wall Street banks that were themselves by then desperate to buy protection against default. This was well in advance of the government bailouts. Because I had been operating in the face of strong opposition from both my investors and the Wall Street community, it took everything I had to see these trades through to completion. Disheartened on many fronts, I shut down Scion Capital in 2008.

Since then, I have often wondered why nobody in Washington showed any interest in hearing exactly how I arrived at my conclusions that the housing bubble would burst when it did and that it could cripple the big financial institutions. A week ago I learned the answer when Al Hunt of Bloomberg Television, who had read Michael Lewis’s book, “The Big Short,” which includes the story of my predictions, asked Mr. Greenspan directly. The former Fed chairman responded that my insights had been a “statistical illusion.” Perhaps, he suggested, I was just a supremely lucky flipper of coins.

Mr. Greenspan said that he sat through innumerable meetings at the Fed with crack economists, and not one of them warned of the problems that were to come. By Mr. Greenspan’s logic, anyone who might have foreseen the housing bubble would have been invited into the ivory tower, so if all those who were there did not hear it, then no one could have said it.

As a nation, we cannot afford to live with Mr. Greenspan’s way of thinking. The truth is, he should have seen what was coming and offered a sober, apolitical warning. Everyone would have listened; when he talked about the economy, the world hung on every single word.

Unfortunately, he did not give good advice. In February 2004, a few months before the Fed formally ended a remarkable streak of interest-rate cuts, Mr. Greenspan told Americans that they would be missing out if they failed to take advantage of cost-saving adjustable-rate mortgages. And he suggested to the banks that “American consumers might benefit if lenders provided greater mortgage product alternatives to the traditional fixed-rate mortgage.”

Within a year lenders made interest-only adjustable-rate mortgages readily available to subprime borrowers. And within 18 months lenders offered subprime borrowers so-called pay-option adjustable-rate mortgages, which allowed borrowers to make partial monthly payments and have the remainder added to the loan balance (much like payments on a credit card).