selection people having to be in a sufficiently positive frame of mind to take surveys (what exactly is the inverse selection effect you imagine from Westerners
In the west I think being willing to spend time to fill in a survey in return for $1.00 is probably a negative selection effect. Happy people are too busy being awesome.
In the west I think being willing to spend time to fill in a survey in return for $1.00 is probably a negative selection effect. Happy people are too busy being awesome.