In chemistry and biology, catalysis is the acceleration (increase in rate) of a chemical reaction by means of a substance, called a catalyst, that is itself not consumed by the overall reaction.
Catalysts participate in reactions but are neither reactants nor products of the reaction they catalyze. An exception is the process of autocatalysis where the product of a reaction helps to accelerate the same reaction. They work by providing an alternative pathway for the reaction to occur, thus reducing the activation energy and increasing the reaction rate. More generally, one may at times call anything that accelerates a reaction, without itself being consumed or changed, a "catalyst".
Similarly, in referral marketing, the product of the reaction (referrals) helps to accelerate the same reaction (more referrals). Referral marketing works by providing an alternative pathway for the reaction (more referrals) to occur, thus reducing the activation energy (your time) and increasing the reaction rate (shorter sales cycle).
Every referral marketing system needs a catalytic person to drive the system. To maintain the control of your productivity, that person needs to be you!