As the financial, manufacturing and economic hub of Australia, Sydney has grown to become a wealthy and prosperous city and its residents enjoy the world’s second highest earnings when measured using domestic purchasing power, among world cities. The largest economic sectors in Sydney, as measured by the number of people employed, include property and business services, retail, manufacturing, and health and community services. Sydney provides approximately 25 percent of the country’s total GDP. The Australian Securities Exchange and the Reserve Bank of Australia are located in Sydney, as are the headquarters of 90 banks and more than half of Australia’s top companies, and the regional headquarters for around 500 multinational corporations. Of the ten largest corporations in Australia by revenue, four have headquarters in Sydney: Caltex Australia, the Commonwealth Bank, Westpac, and Woolworths. Of the 54 authorised deposit-taking banks in Australia, 44 are based in Sydney including nine of the 11 foreign subsidiary banks in Australia and all of the 29 local branches of foreign banks. Major authorised foreign banks in Sydney include Citigroup, UBS Australia, Mizuho Corporate Bank, HSBC Bank Australia and Deutsche Bank.