At the time of William Eggleston's exhibition, color was shunned in serious photography circles. Until then photographers used color only for advertising and journalism, and it was widely despised by the mainstream art world of the time.
Poverty isn't a "money problem." It's not about having to wait to cash out your 401k or your IRA or some of your stocks. It's having nowhere to turn for money. It's wondering which bill can be paid and which bill can be put off.
It's often been observed that one must leave the country of birth to see it more clearly, a truism that applies to politics, but also to art. The exhibit of Walker Evans at Die Photographische Sammlung in Köln is a perfect case in point.