The millionaire's club isn't what it used to be.

Time was that "being a millionaire" was a mark of unimaginable success. You'd joined the financial elite. People didn't much discuss whether you arrived by wealth or income, because it didn't matter much. The millionaire's club was so small that the path to membership wasn't worth discussing.

Millionaires aren't as common as water, but there are plenty of them. A new study puts the worldwide total at 35 million in 2014, with about 40 percent (14 million) of them American. That's about 5 percent of the U.S. adult population (241 million in 2014) or one in 20. Rarefied, yes; exclusive, no. After the United States, Japan has the largest concentration of millionaires with 8 percent of the world total, followed by France (7 percent), Germany (6 percent) and the United Kingdom (6 percent). At 3 percent, China ranks eighth.