I love these comments about a bubble in one of the most coveted cities in the world when interest rates have been at their lowest ever. What is causing this bub

I love these comments about a bubble in one of the most coveted cities in the world when interest rates have been at their lowest ever. What is causing this bubble that prices would decline so much that they would match Barcelona, a great city but not one desired by people all over the world in the center of the financial capital of Europe.