Forbes does not create lists of millionaires, but does have lists of billionaires whose income is actually updated daily. The list includes all of the billionaires across the world and shows how many millions or billions they lost for that given day. The lists include the billionaire's name, net worth, age, how they make their money and what country they are from.
The magazine runs articles yearly that cover the riches people in America and other countries. These lists cover the top 400 billionaires and millionaires depending on the total annual income of these individuals. It is possible that the millionaires will not make it onto the list, or move from millionaire to billionaire with a successful year.