This document discusses the four key variables in any negotiation: timing, contract length, deal size, and payment terms. It explains how changing one variable affects the others and provides examples of how understanding these relationships can give buyers and sellers leverage in negotiations. Specifically, it outlines strategies for using one variable, such as being willing to sign immediately, to negotiate better terms on the other three variables. The overall message is that recognizing the interplay between these four negotiation levers allows people to adjust them strategically for a fair and advantageous outcome.