Breja: It's not the economy as much as the the fact we're running out of space.
Actually besides the biggest metropolizes, there is ALOT of space around. Longer distances do not matter these days as much as many work could be done from home via internet.
What we really are running out of is (cheap) resources, energy and solving the problem who owns the land.
I also guess many other countries besides Finland, have some political problems - some (rich) people benefit greatly from high housing costs and it is in their benefit to keep such policies in effect.
-> we have lots of space, ridiculously high rents and year-after-year they still arent making real effort to zone more of that sort of residential areas + build em.