Would you like to become an "expert" in a field that really defies easy expert prediction? Here's how: Take a group of things in that field that have already proven themselves to be successful. Then find common characteristics among the items in that group. Put forward those characteristics as your own personal advice about how to be successful in said field. Then, when your audience discovers that simply staring at a bunch of characteristics of things successful in the past does nothing to help them make the hard decisions about the future, you can just shrug and say, "Hey, these things are complex!" This works for "experts" in stock picking, politics, and, especially, marketing.