90% is actually quite healthy. If all housing was always full, there is no slack in the system. We should always have some overcapacity in the housing market, j

90% is actually quite healthy. If all housing was always full, there is no slack in the system. We should always have some overcapacity in the housing market, just like we do for hospital beds, food, water, etc. If you're always buying the last loaf of bread at the grocery store, that means others don't get bread when they want to buy it.