Greater London is often referred to as "the City" or "the Square Mile" and it forms the main financial district. Archaically, the urbanised area of London was known as the Metropolis. In common usage, the terms "London" and "Greater London" are usually used interchangeably. Greater London is officially divided for some purposes, with varying definitions, into Inner London and Outer London. For some strategic planning purposes it is divided into five sub-regions. Greater London is under the strategic local governance of the Greater London Authority (GLA). It consists of an elected assembly, the London Assembly, and an executive head, the Mayor of
City of London households and the lowest average household size: just 1.58 people. It also ranked highest within the Greater London area for the percentage of people with no religion and people who are employed. The City vies with New York City's Downtown Manhattan as the financial capital of the world; many banking and insurance institutions have their headquarters there. The London Stock Exchange (shares and bonds), Lloyd's of London (insurance) and the Bank of England are all based in the City. Over 500 banks have offices in the City, and the City is an established leader in trading in Eurobonds, foreign exchange,