I'm working on the executive summary for my website idea and need to figure out the total market capitalization for the this industry.
For example, if all the yearly advertising (and other) revenue of Yelp, UrbanSpoon, OpenTable, Zagat, etc. were all combined, that would total out to the total available market for the online restaurant review industry.
Any specific websites, key words to look for, firms that provide this research, or any other specific/concrete tips that would help me get the answer to this?
Keep in mind that I am NOT asking how to valuate or determine the market valuation for a specific business or company, but rather what the entire industry is "worth" in terms of total number of users X the average revenue per user (ARPU).