Two years ago I wrote that banks shouldn't lend people more than three or four times their annual salary.
This was at a time when banks couldn't give people money fast enough, knowing full well that house prices were rising so fast that even if a borrower defaulted the bank would be on a good bet if it forced a sale.
Back then I pointed out that in the UK the Bank of England had told lenders to restrict loans to 4.5 times a person's annual income.
It's a simple measure that restricts what people can pay for a home, and so helps keeps prices down to affordable levels.
I also wrote that borrowers who avoid spending every penny on loan repayments will be in a better position to survive redundancy, unexpected bills and rising interest rates (which are trickling up now).