"Assuming they are typical Americans, they likely have less than $400 in savings"

 Show your work, the article pointed to by your supplied link  makes no such reference to the 400 dollar figure.
Given the diversity of 333,333,333 people the 'typical American' is probably meaningless with regard to how much money the people at a protest march have. Is 'typical American' the same as 'average American'? 

What is the source of the 400 dollar figure that you base much of your article on and if there is a source does anyone beside you agree with it? Or did you just make it up in the name of poetic license?