Seth Godin suggests (paraphrased) - Look at an industry as it exists currently.. Think of the Sacred Cows- "This industry ALWAYS....", and then question what would happen if they weren't there.
What would happen if "Enc. Britannica didn't need door to door salesmen to deliver a product"?
What would happen if "Enc. Britannica didn't need door to door salesmen to deliver a product"?