The Financial Post reports in its Thursday, Nov. 7, edition that Bank of Canada deputy governor Carolyn Rogers is warning policy-makers against "tinkering" with the mortgage market to improve housing affordability, as such measures could lead to long-term negative effects. The Post's Jordan Gowling writes that the federal government has recently introduced new mortgage rules, including expanding 30-year amortizations to all first-time homebuyers and raising the price cap for insured mortgages from $1-million to $1.5-million. However, Ms. Rogers cautioned that longer amortizations and smaller down payments increase risks for both lenders and borrowers. She illustrated this with an example of how extending amortization from 25 to 30 years can reduce monthly payments but increase total interest costs. Ms. Rogers emphasized that a better balance between supply and demand is essential for improving housing affordability. She said, "In the meantime, leaning too much on measures that reduce the short-term cost of financing could have long-term impacts on the financial health of households, the mortgage market and the economy."