What is the significance of actuarial interest in determining mortgage rates?

Actuarial interest is important in determining mortgage rates because it helps lenders assess the risk associated with lending money for a mortgage. By using actuarial interest, lenders can calculate the likelihood of a borrower defaulting on their loan, which influences the interest rate offered. This helps ensure that lenders are compensated for the risk they take on, ultimately affecting the mortgage rates that borrowers are offered.