Has America's economy gone K-shaped? Here's what to know

USA TODAY - For more and to sign up click here Andrew Dorn The U.S. economy is pulling apart: Booming for some, breaking for many. In other words, it's looking K-shaped — one branch climbs while the other falls. For those on the upper arm, things are going well. The top 10% of U.S. households now account for nearly half of all consumer spending, buoyed by record stock market highs. Hourly pay is now rising…