The Forbes 400 or 400 Richest People (first publishe in 1982) is a list published by Forbes Magazine magazine of the wealthiest 400 Americans, ranked by net worth. The list is published annually in September. In 2007, the combined wealth of the 400 was $1.54 trillion, and all of the members of the list were billionaires. The minimum to make the list in 2007 was $1.34 billion.