Average incomes within the city are the overwhelming determinant of the demand side of housing supply and demand.
A dozen billionaires are not going to materially affect the availability of housing, even if they all buy huge estates. Average income determines what the vast majority of the city's renters are able to afford to pay for rent.
In any case, San Francisco is not even in the top 10 for number of billionaires among cities:
https://en.wikipedia.org/wiki/List_of_cities_by_number_of_bi...
>>Honestly I don't understand why you use these arguments and sources, they seem to me to be completely incompatible with reality.
I suggest you actually read the article I linked to. It describes what economists at large think of rent control, and what studies on the effects of rent control have found.
>>You keep mentioning rent-control, but I have never said that it's the measure I am for. You do realize rent-control is not the only policy that a city or government can use and enforce right?
I brought up rent control because you wrote the following, which implies cities with rent control have had a positive experience with it:
>>I’d expect the opposite, as you see in countries that have rent and ownership controls.