Disposable
Google Definitions
(of an article) intended to be used once, or until no longer useful, and then thrown away.
(chiefly of financial assets) readily available for the owner's use as required.
My Take on this word
It makes sense to continue to use this word for things that are meant to be used once. However, I don't think it makes sense to use this word as it is being used within financial realm. (E.g. Disposable Income)
I think it creates wrong connection for financial domain. The word "disposable" itself can create a misleading impression that the income is meant to be quickly discarded or wasted.
Instead of disposable income we can say "investable income".
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