I live here https://www.bmcadventures.com/blog/stmap_81shynnt.html?levitra.zhevitra.ziac viagra sau cialis forum  A: A lot of things can't be modeled very well. In the book, I look at how difficult it is for economists to forecast jobs and growth. The techniques used are either algorithms or you spitball it (guess at the answer). Neither works all that well. Some of that is acknowledging that the economy is an incredibly complex organization. It's hard to predict 3 million people interacting with each other. Politics are an empirically answerable question. The polls in general elections are pretty reliable, and you can trust them 90 percent of the time. That's not as true in primary elections because it's a different turnout.