I think you overestimate the sophistication of the models the banks use. There's no reason for them to use honest models. If things turn to shit, the public wil

I think you overestimate the sophistication of the models the banks use. There's no reason for them to use honest models. If things turn to shit, the public will bail them out anyway. So the banks may well say "if you spend a minimum on food and clothing, and nothing on anything else, you can afford to pay high rates." But that's not what regular people would mean by affording it.