Answer: 
  • Mintel Academic contains market size and share data for consumer markets in the U.S., the U.K., and a handful of other countries.
  • Gartner Intraweb supplies market size data on the Information Technology industries.
  • Passport (Euromonitor) covers many industries worldwide and has market size data including forecasts.
  • Trade associations are often a good source of market size information. Associations Unlimited provides searching ability of more than 460,000 international, national, regional, state, and local organizations, including non-profits.
  • An article search will sometimes be the most effective way to find market size information.