分层式计算法可以确保每个人，不论住屋类别，都可以负担得起最低层的收费。
A tiered tariff can assure everyone, regardless of household type, of affordable baseline consumption.
她认为如果我们用计算水费的分层式计算法来收取电费，国人将必须承担更高的电费。这是因为第一层用水收费就已经定在收回全部供水成本的水平。
The tiered system I envisage for electricity is not one where the baseline tier is already set to recoup full cost, with a tax artificially imposed on excess consumption, as is the case for water.
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