"The Poor Get Richer"

Michael P. blogged, the other day, about the Times story on income inequality.  He asked if Catholic Legal Theory has anything to say about income inequality.  I hope the answer is "yes."  The harder question (for me), though, is:  What is that something?  And, relatedly, of what relevance are the facts discussed in this piece, from the Wall Street Journal, in a piece called "The Poor Get Richer"?