How mortgages work
by Gilbert Keith
"Definition of ‘Primary Mortgage Market’
The market where borrowers and mortgage originators come together to negotiate terms and effectuate mortgage transaction. Mortgage brokers, mortgage bankers, credit unions and banks are all part of the primary mortgage market.
Then start perusing through the related terms below the definition.
This was motivated by a discussion of interest rates with a colleague yesternight, and this article: http://www.economist.com/news/finance-and-economics/21572796-feds-frustration-mortgage-profits-have-been-soaring-spread-besting