Ask YC: What are the most profitable online markets?
https://news.ycombinator.com/item?id=91677I've been looking but i can't seem to find any information as to the size of different online markets.
for example. The size in revenue of Travel (expedia,kayak,priceline) The size in revenue of Gambling(pokerstars,fulltilt) The size in revenue of Rentals (gamefly,netflix) and so on..
also the spending of ad dollars and how they pertain to the web ad based economy as a whole.