What type of revenue do commercial banks primarily derive for mortgage financing?

Commercial banks primarily derive revenue for mortgage financing from demand deposits. This is because mortgage loans are typically funded by the deposits that banks collect from customers. When individuals deposit their money into savings or checking accounts, banks can use those funds to provide mortgages to borrowers.

Demand deposits represent a major source of liquidity for banks and enable them to extend loans while maintaining a stable funding source. As borrowers repay their mortgages with interest, the bank earns revenue from the interest payments on those loans, which can be generated from the capital initially funded by those demand deposits.

In contrast, commercial loans, equity investments, and real estate sales do not serve the same direct function in the context of mortgage financing. Commercial loans represent business financing rather than residential mortgages, and equity investments relate to ownership stakes rather than lending. Real estate sales involve the transaction of properties rather than the financing aspect inherent in mortgages.