One, among many, of the reasons for the collapse as stated in the book:
But the idea that the mortgage-backed securities would also lead inexorably to the rise of the subprime industry, that would create hidden, systemic risks the likes of which the financial world had never before seen, that they would undo the connection between borrowers and lenders in ways that were truly dangerous--that wasn't even in their frame of reference.
Now change out a few words and see what happens:
But the idea that the fast food, junk food, and highly processed foods would also lead inexorably to the rise of the an obese and unhealthy nation, that would create hidden, systemic risks the likes of which the medical industry had never before seen, that they would undo the connection between consumer and farmer in ways that were truly dangerous--that wasn't even in their frame of reference.