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How can a fixed interest rate mortgage be an advantage of homeownership? - fixed interest mortgage

The advantage is that we know that the monthly principal and interest payments for the entire period to keep that loan.

You have heard of home and apartment owners with variable mortgage? You can stay the same for 2 years (or what ever is agreed), then prices may rise or fall next year and the years ahead. The descent is not bad (low cost). Climbing can be prohibitive.