Something most investors find difficult to do during down markets is simple: Stay interested. This is totally understandable–for me, this is my job and my passion, so following the stock market is something I do no matter where I am (though on vacation I’m obviously not checking stocks every 10 minutes). The average investor, on the other hand, has a real job as well as other passions, so if the market isn’t doing anything grand, he has no reason to pay much attention to it on a day-to-day basis. I am here to tell you, though, that such thinking...