I guess you're asking about how interest rates and house prices work in the consumer house price index with ownership shelter costs. It gives a very different answer than when you just look at current house prices, because what the CPI is trying to do is measure the impact on the average Canadian homeowner of increases in interest rates and changing house prices, and not everyone is buying a home today at current rates. The mortgage debt reflects an average across Canadian homeowners, and the interest rate reflects an average across Canadian homeowners.
Current conditions don't get fully reflected in the CPI. I think I'm answering your question. It takes into account more of an average. It reflects the burden on an average homeowner's pocketbook of owning a home today. It's not at the margin, but an average across all homeowners.