"This is clear from the Census's own data: low income persons spend $1.94 for every $1.00 in "income" reported by the Census."

They probably have a very hefty credit card debt.

"While in any given year 12 to 14 percent of the population is poor, over a ten-year period 40 percent experience poverty in at least one year because most poor people cycle in and out of poverty; they don't stay poor for long periods, Poverty is something that happens to the working class, not some marginal "other" on the fringes of society." - Micheal Zweig, What's Class Got to do With It, American Society in the Twenty-first Century, 2004

Emphasis on working class.