Freddie Mac, the taxpayer-owned mortgage giant, has placed multibillion-dollar bets that pay off if homeowners stay trapped in expensive mortgages with interest rates well above current rates.
Freddie began increasing these bets dramatically in late 2010, the same time that the company was making it harder for homeowners to get out of such high-interest mortgages.
No evidence has emerged that these decisions were coordinated. The company is a key gatekeeper for home loans but says its traders are “walled off” from the officials who have restricted homeowners from taking advantage of historically low interest rates by imposing higher fees and new rules.