What is ”the margin”? It’s that space on a line, in the middle, between two extremes, where the transition from ”yes” to ”no” occurs. If I offered you a million dollars for the computer you’re reading this on (for broad definitions of ’computing device’), you’d probably take me up on the offer. For 0 dollars, you would not. Somewhere, in the middle, is a number where you’d change your mind from ”nope, won’t sell” to ”well… sure, what the heck”. That is, loosly defined, a margin. #

David N. Welton: Thinking at the Margin #