The boom appears limited to the larger cities where building new houses is harder (Swedens cities are in general small and widely spread with lots of forest adn parks, on an international scale). In my approximation similar houses goes for around ten times more in Stockholm then in areas where new development is easy and prices are close to the cost of production.

In general Sweden has experienced a long and slow depopulation of the countryside, in particular in northern Sweden, but services are kept up and houses nobody wants to live in are in general tore down in an orderly fashion and the land converted to productice use.

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