[vineyardmike]

> Cities like Lisbon have virtually infinite demand due to how attractive they are and how many people would like to live thre, so yeah, you would technically need infinite housing

Well obviously "infinite" is not true since there are limited people on earth with mobility to visit Lisbon, and not everyone would want to visit, and not everyone can do it at once...

But in good-faith arguments, there is a lot of difference between "build on an empty lot" and "turn Lisbon into Manhattan". As others have pointed out, there are a lot of crumbing buildings in Lisbon. You don't need "more" forever, you need "more" until demand is satisfied or supply of buildable area is exhausted (which it is not).

[ajsnigrutin]

Also, there are areas on the edge of lisbon, that could become a new manhattan there.

Look at Belgrade for example... after the war, when the city was "full", the communists decided to build more, took an empty swampy area across the sava river, and started building... A LOT:

before: https://www.4zida.rs/blog/wp-content/uploads/2016/02/novi-be...

After (a tiny part): https://upload.wikimedia.org/wikipedia/commons/thumb/0/05/Be...

I live in slovenia, and similar projects were built here, and A LOT of them... somehow all the building stopped after we gained independence.