Despite what you suggest the other day that we have plenty of land, the land closer to the city where people want to live is finite. So to increase supply you have to increase density, building high rise is not cheap so apartments are not cheap.
Developing land further out is not cheap either, you need infrastructure like roads, power, water, gas and sewage while also providing public open space, schools ect
You only have to look at Sydney were you are had pressed to find a 1 bedroom apartment for under $500k or 2 bedroom apartment for under $1millon, how the hell do you increase supply and make it affordable?
We also expect wages to rise to keep up with inflation, that means costs of building homes and apartments continues to rise and with that so too the value of existing homes and apartments.
Supply and demand are not some thing that can easily be controlled
