This ProPublica article by Jesse Eisinger explains that, during the depths of the Great Recession, Freddie Mac would not lower consumers' interest rates because it wanted to keep its profits high. Here's an excerpt:
Freddie Mac, the taxpayer-owned mortgage giant, made it harder for
millions of Americans to refinance their high-interest-rate mortgages
for fear it would cut into company profits, present and former Freddie
Mac officials disclosed in recent interviews. … [T]wo Republican-leaning board members and at
least one executive resisted a mass refi policy for an additional
reason, according to the interviews: They regarded it as a backdoor
economic stimulus. Freddie's policy was financially brutal: During the worst years of the
Great Recession, when homeowners most needed the savings they could have
gotten from refinancing to lower interest rates, Freddie helped keep
millions of borrowers locked in high-interest-rate mortgages. A more aggressive refi program by both Freddie and its sister company
Fannie Mae would have helped an additional nine million homeowners to
refinance, saving them nearly $75 billion in interest payments to date,
Columbia University housing economist Christopher Mayer estimates. In
addition, it would have prevented hundreds of thousands of delinquencies
and foreclosures, he says.