It's true that people have more disposable income than ever, but surprisingly, they also have more debts.

disposable 来自动词 dispose（处理、处置），加上后缀 -able 构成形容词，表示"可处理的、可支配的"。 income 是名词，由 in（进入）和 come（来）组成，字面意思是"进来的东西"，引申为"收入"。 disposable income 指扣除必要开支后可以自由支配的收入，即"可支配收入"。