Citigroup CEO Jane Fraser said Monday that consumer behavior has diverged as inflation for goods and services makes life harder for many Americans. Fraser, who leads one of the largest U.S. credit-card issuers, said she is seeing a "K-shaped consumer." That means the affluent continue to spend, while lower-income Americans have become more cautious with their consumption. "A lot of the growth in spending has been in the last few quarters with the affluent customer," Fraser told CNBC's Sara Eisen in an inter ...