kes the Solomon and Levy model much more powerful as a general model. This is returned to in section 1.2 below. It is however my belief that reading Simkin and Roychowdhury by all those involved in modelling power laws would make their lives a lot easier. Finally it is important to note the difference

gives a power tail. A non-zero barrier, provided by wage income, is an essential part of the GLV model discussed in section 1.2 below. The paper of Simkin and Roychowdhury is illuminating and entertaining. It shows that the same basic mechanisms for producing power laws, and branching processes in gene

s pains members of the local yoga community. "It's a terrific thing for him, but it's ter- rible to have him leave," said Merrill Katz, who taught Simkin and sent her to Elsner for further training. "He's one of the most knowledgeable teachers we have in this ar- ea, and she was always very talented.