I think he mixed up the two terms;
"Liquid assets"
"Disposable income"
[spoiler]and I'm guessing from your post that you knew that already... My superfluous reply is superfluous[/spoiler]
English
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Agree with your presumptions. Just assumed some it was some early onset deterioration of faculties while yelling "you kids get off my lawn!"
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Haha hopefully from a rocking chair on the porch while sipping some sweet tea.