The Bloomberg Billionaires Index is a daily ranking of the world's richest people. The index debuted in March 2012 and tracks the net worth of the 500 wealthiest people on the planet. It draws information from "action in the stock market, economic indicators and news reports," features a profile of each billionaire, and includes a tool that allows users to compare the fortunes of multiple billionaires. The index is updated every day at the close of trading in New York.