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by muzani 2116 days ago
It used to be possible to do this with Google Trends, but they removed the number of searches and the y-axis is along the lines of 100% popularity now.

Otherwise I just compare to competitor products to see if the market is sizeable. I've done analysis before with a cofounder and things like keyword popularity also helps, but in the end it doesn't really do knowing that there's a huge market for "jobs for teens" sites unless you want to make a product for that.