Macau is the fastest growing casino gambling (or "gaming") market in the world. From 2001 to 2006, gaming revenue in Macau has grown at an annual rate of 23%. By comparison, Las Vegas and Atlantic City had CAGRs of 4% and 3%, respectively. The biggest driver of growth is its proximity to the increasingly wealthy Chinese population.
Only 6 companies are licensed to operate gaming facilities in the region:
Statistics based on macau statistics and census services 
^Estimates based on “Visitors Arrivals for October 2007”