" can you tell me where I can find a restaurant where you can eat for nothing?” “My dear man,” replied van Schmoller, “there are no such restaurants, but there is a place around the corner where you can have a good meal very cheaply.” “Ah,” said Pareto, laughing triumphantly, “so there are laws in economics! "

― Albert-László Barabási , Linked: How Everything Is Connected to Everything Else and What It Means for Business, Science, and Everyday Life