That is true until you take child mortality rates into account. I don't actually want to know the child mortality rate in fucking praag but I am assuming a stupidly high number.People in poorest areas, where survival is fraught, tend to birth more progeny so that at least some will make it to adulthood. That ironically means that atrocious living conditions can lead into overpopulation.
That is a somewhat fair point but doesn't actually impact my own point for that specific argument (it does however go against the easiness of moving away.)What part of 'there are people living in the slums' says to you those people have enough money to buy a house? Like...I'm not saying there aren't more people than houses in Praag, I'm saying that the people who don't have a house probably can't afford to buy one.
Now, 'what about rich people buying them to rent them out?' you might say. And that's fair, but if that's true then most people probably don't have their own house, they're renting. So the renting majority can't move because they don't have any assets to sell and get the money together.
Praag is not emptying out, praag is full, maybe not to bursting but full enough.