该理论考虑，在每一个可能的单位价格上，买方总的需求量和买方总的供应量。
The theory considers aggregates of quantity demanded by buyers and quantity supplied by sellers at each possible price per unit.
上述公营和私营房屋单位建屋量的划分，会因应这两类房屋需求量的改变而作出调整。
Changes to the breakdown between public and private sector housing will be made, if necessary, to reflect changes in housing demand.
这个数字包括了每年多出5000个单位的“容差”量，即较目前预计的房屋需求量多出6%。
This represents a 'safety margin' of 5000 flats a year, or 6 per cent of the current forecast of housing demand.
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