They are not perfect substitutes. If they were, no one would be paying $2.4m for this postage stamp in Sunnyvale. There is plenty of supply below $2.4m. The 20

They are not perfect substitutes. If they were, no one would be paying $2.4m for this postage stamp in Sunnyvale. There is plenty of supply below $2.4m. The 20 people who made offers on this house weren't interested.