<p>Some questions are unanswered even though they are interesting, well informed, well expressed, and well posed. I assume they are unanswered because the expertise to answer the questions does not exist on this forum. So, "How to decrease the number of unanswered questions?" Answer: CrossValidated somehow needs to attract more experts who could answer these questions. How to do that? These experts need to know that CrossValidated exists, so advertising to them might help. They need it to be worth their while to participate. The most obvious reward is money. CrossValidated pays with reputation points, but experts know they're good already and may not be motivated by that.</p>
