Killiana1a on 06 January 2011
Only in hindsight will one know all the variables. Even then, the process of knowing every single variable would take some time. Thus forth, every prediction is going to have variables not factored in until hindsight analysis including tangential variables such as the economics of each country in the market, changing demographics, weather (if a blizzard or freak of nature hits during a launch day), and on.
You are right.
