Metcalfe’s Law comes from the world of I.T. and it derives from the simple observation that every time we add a new computer to a network we have the possibility of adding as many more links as there are computers in the network. Metcalfe’s law then, states that the value of a telecommunications network is proportional to the square of the number of connected users of the system.  As each person who joins the network makes it more valuable, Metcalfe’s law leads to the value or power of a network increasing in proportion to the square of the number of nodes on the network, this is of course not restricted to just computer networks but is a feature of many types of networks.