"If it was just investors why would rent be as close to mortgage payment amounts as it is?" I am not clear how this is meant to prove anything, an influx of in

"If it was just investors why would rent be as close to mortgage payment amounts as it is?" I am not clear how this is meant to prove anything, an influx of investors increases prices and rent, both. perhaps it's better to call them speculators, because they don't invest in the economy to create new properties, just inflate prices on existing ones.