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No, that argument assumes you can only blame 1 thing at a time. Even if the bureaucracy is the worst offender, every foreigner buying a house still results in 1 less house for Spaniards. Sure, fix bureaucracy, but don't pretend foreign purchases have zero effect. |
In a very limited scope, sure. What that foreign capital also does is lower risk and thus capital costs for development and improvement. (In the event of a limited crisis, for lenders as well.) Whether the net effect goes one way or another is more complicated than what you describe.
Put another way, if foreigners could only buy unbuilt units, would you still say they're resulting in fewer houses for Spaniards? Do the countries shunned by foreign investors have affordable housing?