Income and Wealth

Distinguishing income (a flow variable) from wealth (a stock variable) is important:

http://www.economist.com/news/finance-and-economics/21640444-oxfam-causes-stir-stat-wrong-yardstick

Trends at the top of income distribution:

http://www.nytimes.com/2015/01/28/upshot/gains-from-economic-recovery-still-limited-to-top-one-percent.html