The document summarizes financial clusters in major cities, including Toronto, New York, London, and Dubai. It notes that Toronto's financial sector generates 12% of the city's GDP and is the fastest expanding in North America, consisting of banks, insurance companies, credit agencies, and securities dealers. New York is ranked first in North America across insurance, banking, and securities. London is the second largest financial cluster and the financial capital of Europe. Dubai is emerging as a regional financial hub in the Middle East due to its stable banking system and favorable tax regime.