Separate but unequal: Charts show growing rich-poor gap
news.yahoo.com
news.yahoo.com
It's worth pointing out that the primary way most professions get more buying power is by prices coming down, not wages going up.
This "barely grown richer" is just flat-out wrong. Everyone in countries with remotely decent governance are much better than people 33 years ago were. Much better. That needs to be acknowledged before any handwringing starts.