This article is not clear; I doubt "停止支付房贷的人群免费住在原来的房子里,省下来的钱就变成了“个人房租收入的增加”。". I didn't do research, but the common sense told me that rental income should come from the statistics of rental income in Federal Tax return. Less people buy house , more people would have to rent as they have to find a place to stay.