Monaco boasts the world’s highest GNI per capita at $183,150. It also has the lowest unemployment rate at 0%, with over 48,000 workers who commute from France and Italy each day. According to the CIA World Factbook, Monaco has the world’s lowest poverty rate and the highest number of millionaires and billionaires per capita in the world. Monaco has the world’s most expensive real estate market, at $58,300 per square metre. One of Monaco’s main sources of income is tourism. Each year many foreigners are attracted to its casino and pleasant climate. It has also become a major banking center, holding over €100 billion worth of funds. The principality has successfully sought to diversify its economic base into services and small, high-value-added, non-polluting industries, such as cosmetics and biothermics. Monaco is not a member of the European Union. However, it is very closely linked via a customs union with France and, as such, its currency is the same as that of France, the euro. Monaco levies no income tax on individuals. The absence of a personal income tax in the principality has attracted to it a considerable number of wealthy residents from European countries who derive the majority of their income from activity outside Monaco; celebrities such as Formula One drivers attract most of the attention, but the vast majority of them are less well-known business people.