Bing and Yahoo search volumes wrt google?

It really depends on the keyword in question as all three search engines attract different kinds of traffic (some have younger users, some older, some more teach savvy, etc. ).

A rule of thumb in my experience for Bing and Yahoo is to expect at most 1/3 or 1/4 of what you would usually get if you ranked the same position over at Google. As always, exceptions are possible ;).

One things for sure now - if I want more precise content I'm going to use yahoo or bing they rank better content higher :).

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