Q. Where do I find statistics and info on wealth?

See the World Wealth Report - from Merrill Lynch and Capgemini

Go to Legatum Prosperity Index from Legatum Institute.

While we do not have access to certain surveys of the affluent, as published by the Luxury Institute or Ipsos Mendelsohn, you may be able to find some data from these surveys cited in articles within the Business Source Ultimate
Search for luxury institute or mendelsohn affluent survey