Last week, we published a chart-essay that illustrates the extreme inequality that has developed in the US economy over the past 30 years. The charts explain what the Wall Street protesters are angry about. They also explain why the protesters' message is resonating with the country at large. Here are the four key points: 1. Unemployment is at the highest level since the Great Depression (with the exception of a brief blip in the early 1980s). 2. 3. 4. Three charts illustrate this: The top earners are capturing a higher share of the national income than they have anytime since the 1920s: CEO pay and corporate profits have skyrocketed in the past 20 years, "production worker" pay has risen 4%. After adjusting for inflation, average earnings haven't increased in 50 years. It's worth noting that the US has been in a similar situation before: At the end of the "Roaring '20s," just before the start of the Great Depression. SEE ALSO: CHARTS: Here's What The Protesters Are So Angry About...