Homebuyers often begin with 'what is your lowest rate?' Lenders begin somewhere else: income, debts, down payment, credit, property, occupancy and documentation. After qualification, the borrower still has structural decisions — fixed or variable, term length, amortization, payment frequency, prepayment features and whether the lender's penalty or portability language fits likely life events.
Insured and uninsured mortgages can also behave differently. Down payment, purchase price, property type, amortization and transaction purpose can determine whether mortgage default insurance is available or required. The lowest rate in one category may not be available in another.
We therefore model both approval and ownership. The first asks whether a lender will make the loan; the second asks whether the borrower still has emergency reserves, can tolerate renewal-rate changes and has enough flexibility for a move, refinance or family change.