1、The total normal vacancy rate should be 3 percent, including new properties ready for sale.
總空置率等于3%才是正常的。其中應該包括待售新房。

2、Commercial housing vacancy rate and what causes prices while vigor?
何種原因造成商品房空置率與房價同時高揚？

3、In a normal market, the vacancy rate should be equal to the number of households relocating.
正常市場中，空置房數(shù)量應該等于搬遷戶數(shù)和平均過渡期的乘積加上新家庭數(shù)量和平均購房周期的乘積。