中产阶级的一个基本特点是，拥有相当数量的可支配性收入。
An essential characteristic is the possession of a reasonable amount of discretionary income.
闲暇时间和可支配性收入的增加，激发了人们对休闲游憩活动的追求。
With the rapid increment of disposable income, people begin to pursue of recreations in their leisure time.
收入的改变，工作的改变和家庭费用的改变反映了这种周期性变化，而其它指标，如作为可支配收入部分的个人存款，数十年来已经逐渐减少了。
Changes in incomes, jobs and home prices reflect this cyclical behavior, while other indicators, like personal savings as a percentage of disposable income, have shown a gradual decline over decades.
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