It is why the Reserve Bank of Australia (and other competent analysts) factor in interest rate when they assess comprehensive measures of affordability. Indeed, numerous RBA research articles of the topic forcefully conclude that the structural lowering of interest rates from the late 1980s has been a vital influence on the rise in house prices but has not significantly impacted affordability.
Unpublished data RBA show a measure of affordability that includes not only house prices and incomes, but also the level of interest rates. The chart of that data, reproduced in the above link, shows the proportion of a household’s income needed to service a loan on an average house with an 80 per cent loan to valuation ratio with a standard variable mortgage over 25 years.
There are a number of standout issues with these findings.
Perhaps most notably is the point that over the past 35 years, the proportion of an average household income devoted to servicing an average mortgage has fluctuated between 20 and 30 per cent and has averaged around 23 per cent. The current ratio is 24 per cent.
In other words, housing affordability right now is close to the long run average and well below earlier peaks. To be sure, it is above the levels on the earlier to mid 1980s and again in the period from the mid-1990s to the mid-2000s, but it is well below the level of the late 1980s and the period around 2005 to 2012.
The interplay of house prices, incomes and interest rates over 35 years has created the environment of broadly steady affordability. If it wasn’t high interest rates that was the burden (the 1980s), it was high unemployment (the 1980s and 1990s) or high house prices (now).
And of course there will always be some areas where prices are out of kilter with the national averages which allows for some people to grandstand about how tough it is to buy a house in these over inflated markets. Fair enough for Sydney and Melbourne at the moment. But rarely do we hear about the myriad of examples of extremely favourable affordability such as in Perth, Adelaide, Hobart, Darwin and a range of regional cities and towns.
For those wishing for falling house prices so they might be able to buy into the Sydney or Melbourne markets, there is a fundamental flaw in their thinking. Price are unlikely to fall unless there is a significant change in interest rates or household incomes.
What if the fall in house prices being wished for by some was due to interest rates being hiked so that mortgage rates were 8 or 9 per cent? What if prices fell because the unemployment rate went to 8 or 9 per cent?
It is likely that is when the complaints would turn to interest rates and unemployment and that the government needed to do something about it even though prices are lower.