The so-called  K-shaped economy is becoming more pronounced, new data shows. In the aftermath of the Covid pandemic, the K has been used to illustrate Americans' diverging economic experiences : Higher-income households are increasingly better off,   while lower-income households are falling further behind. A new report by credit reporting bureau TransUnion found that while credit conditions have improved for a large segment of consumers, others are struggling in the face of higher costs and rising debt burdens. The K-shape is "alive and well," said Michele Raneri, TransUnion's vice president and head of U.S. research and consulting. Read more CNBC personal finance coverage Treasury announces new Series I bond rate of 4.26% for the next six months Social Security benefits can be reduced for retirees who work.…