Sure, but the size of that home has certainly increased significantly. The quality of that home has also increased. The quality of the neighborhood likely has a

Sure, but the size of that home has certainly increased significantly. The quality of that home has also increased. The quality of the neighborhood likely has as well. Could the explanation possibly be that people generally settle on it being worth spending a certain percentage of their income on a home? If that were the case, no matter if people in general are becoming more or less well off or if homes are getting more or less expensive, the percentage of their income that people spend on them may hover around the same area.